# Qgis 3 Fix Geometry

3 For too short call cases like ‘36 seconds continuous wav recordings’, although the last sample was complete, earlier splitting engines would ignore the last sample’s tail in the ‘tail pair’ comparison checks (to avoid cases where trailing silences were too less), however we have now improved the engine to also safely check with. If it’s missing on your computer, then something went wrong when you were installing this package. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere. osm XML file or by direct download from the OpenStreetMap API. IXL is the world's most popular subscription-based learning site for K-12. This tool uses the same logic as the Check Geometry tool, but when a geometry problem is discovered, the relevant fix (listed below) is applied. This tutorial will discuss how to create contour lines in QGIS. Read more >>. It adds support for OpenStreetMap raw vector data, bringing it in as a layer either from. A useful resource for Christmas time which includes a range of great number activities which are aimed at Year 1 pupils (5 - 6 years). Really clear math lessons (pre-algebra, algebra, precalculus), cool math games, online graphing calculators, geometry art, fractals, polyhedra, parents and teachers areas too. 7 - Fluently multiply within 100, using strategies such as the relationship between multiplication and division or properties of operations. Sadly, I can’t tell you exactly what was said (I’d have to kill you apparently according to the organizers) but Matt McGee of SmallBusinessSEM. If the answer isn't right, the correct answer will display to the right of the counter when you reset the problem. Java Math Operator Precedence. dll? Fix4dll can help you! Free download missing dll files for Windows 7, 8, 10, Xp, Vista. Jump and fly your way through danger in this rythm-based action platformer! Jump to. It adds support for OpenStreetMap raw vector data, bringing it in as a layer either from. CoGo ('coordinate geometry') refers to its ability to handle both types of coordinates used in land surveying, namely cartesian coordinates (x,y; long/lat. If you draw a ray with a pencil, examination with a microscope would show that the pencil mark has a measurable width. The basic elements of the application GUI are similar to ArcMap's. Get these online resources now!. Throughout the first nine sessions, you will explore the properties of geometric figures, make constructions using pencil and paper and dynamic software, practice using mathematical language to express ideas and justify your reasoning, and begin to explore the basis of formal mathematical proofs and solid geometry. com gave a fantastically detailed presentation on all facets of local search. Math-U-See from Demme Learning is a complete, skill-based, multi-sensory homeschool math curriculum for grades K-12 that’s designed to teach students skills in a logical sequence. For some questions, you will consider how the passage might be revised to improve the expression of ideas. Used by millions of K-8 students worldwide, FIM develops critical skills and improves the way students feel about math. • Geometry Content in High School Mathematics Video Series • Foundations of Algebra Professional Learning Videos • Foundations of Algebra Module-by-Module Professional Learning • Looking Inside Mathematics Classrooms Video • Global Strategy Stage (GloSS) and Individual Knowledge Assessment of Number (IKAN) Prezi. 15 v 2018 QGIS is a Free and. (needs some editing, but it shows the basics). Zearn is a nonprofit organization on a mission to ensure all children love learning math. Toggle the editing mode, pick the QGIS "node tool" and select the offending geometry, in the bottom left corner you will see a message. Fix problems with Facebook games, chat and more This article describes how to troubleshoot problems you might encounter while using Facebook in Firefox. Add PostGIS data to QGIS. 🙂 He also gave me a good tip. 0) works a little differently than the 2. 0 Nodebo version of QGIS. 3333 or k=0. 0 licence (CC BY-SA) Select graphics from The Noun Project collection Textual error, missing text or you know better: fix me. In the Add Geometry Attributes window, set the Input layer to be processed by either selecting it from the drop-down list or clicking on the browse button and navigating to the file. Learn all the steps for extending the latest version of QGIS (3. Math disabilities can arise at nearly any stage of a child's scholastic development. To cancel the installation, click Cancel. Verify Game Installer Folder Privileges 1. Since it brings many features and upgrades such as improved editing of geometry, symbols, design, 3D layer, etc. Negative area. Spherical geometry is the geometry of the two-dimensional surface of a sphere. Trigonometric sine calculator. To see the collection of prior postings to the list, visit the Qgis-user Archives. Math crossword puzzles make it fun for students to review addition, subtraction, multiplication, and division. This is a giant leap forward for the project - our first Long Term Release based on the 3. In order to calculate sin(x) on the calculator: Enter the input angle. Ingenious! Students hunt for and correct errors in daily passages that cumulatively tell a story. How To: Find the centroid of polygons using Calculate Geometry Summary. Click to release the bubble. 8, there has been an increased focused on creation of quality automated regression (“unit”) tests designed to flag issues in code before the code is introduced to the QGIS codebase. This bug hides some vector processing tools (GDAL tools) found under the "Vector" menu. We also use the Math. round works. As previously mentioned, the map() function uses integer math. ) Open QGIS and open a polygon shapefile layer in QGIS. Simple one touch game play with lots of levels. As the previous versions of QGIS, the software is really intended to make more spatiall analysis and management with less effort, however this version has new tricks and a new order to locate tools. Prior to the 10. In projective geometry, a fixed point of a projectivity has been called a double point. The formulas below can be used to square a wall or deck frame (the Pythagorean Theorem), calculate the area of a circle , calculate the volume of a cylinder , calculate the circumference of a circle , and more. or Best Offer. Rather, this will limit (outline) the area that you define using a SQL expression. These functions cannot be used with complex numbers; use the functions of the same name from the cmath module if you require support for complex numbers. So fractions might get suppressed due to this. The master widget is split into a number of rows and columns, and each “cell” in the resulting table can hold a widget. A home equity line of credit (HELOC) can be another source of fix-and-flip funding for investors. The factors of 18 are 1, 2, 3, 6, 9, 18. dealer’s pricing and sales con ventions, the relevant indices needed to determine pric ing, formulas for and examples of pricing, and a review of variables that have an affect on market and. The function then filters the result to upsample it by p and downsample it by q, resulting in a final sample rate of fs. APPLIES TO: SQL Server Azure SQL Database Azure SQL Data Warehouse Parallel Data Warehouse Converts an invalid geometry instance into a geometry instance with a valid Open Geospatial Consortium (OGC) type. Any of the issues listed above can be completed in QGIS searching through their massive selection of geo-algorithms. In some, you can simply practice solving equations. This module is always available. Introduction; Basic GIS operations. The resulting polygon map can be loaded directly into StatPlanet to create an interactive point map, such as an interactive map of world cities or US cities. To start with, I found following example code from the book "BUILDING MAPPING APPLICATIONS WITH QGIS", but it always crashes when I call the method of self. This Resource Center supports users of the award-winning Dynamic Geometry ® mathematics visualization software, The Geometer's Sketchpad. There is 3000 apples in A, and the apples have to be delivered to B. The available car can take 1000 apples at most. My search in the plugin-tool in QGIS revealed the following suitable plugins: Geotag and import photos (needs exiftools installed 🙁 ). The writing they produce actually expands their understanding of a concept. How to use Function Editor in QGIS Field calculator JUNE 05, 2015 analysis howto python qgis In QGIS 2. I had been wanting to get a copy of this book for years, and I kept looking if I could find a used copy for $10-$20 somewhere. The more daring began to leave behind the standard geometric way of thinking in which linear (first power) variables corresponded to lengths,. Verify Game Installer Folder Privileges 1. Before this 3. In each case we assume that the engine is being run full throttle. Download QGIS; 2. Invalid geometries can cause a lot of headache: from missing features to odd analysis results. Introduction; Basic GIS operations. Turn to Section 2 of your answer sheet to answer the questions in this section. I am on a mac, if you are on a pc I feel bad. How To: Find the centroid of polygons using Calculate Geometry Summary. Really clear math lessons (pre-algebra, algebra, precalculus), cool math games, online graphing calculators, geometry art, fractals, polyhedra, parents and teachers areas too. 4 open and view vector data. Write related words – turn nouns into verbs, verbs into nouns, adjectives into adverbs, etc. All writing is help on writing custom apps with qgis a tailored for your niche and will be optimized for Google best practices. In earlier QGIS versions, these blur settings did not take into account the DPI of the map render — resulting in inaccurate effects rendering when exporting canvases/layouts at high resolutions. The French QGIS user group will hold its #QGIS user conference on the 13 and 14 of Dec. 0 is the first major release since September 2013 when QGIS 2. You need to know the task. Color CCD Camera. The built-in Diskpart Windows utility can also be used to mark a partition as active. 3) When beginning to work a Math problem, do not "map out a path from problem-to-answer" in your head before writing anything down. 3n for any n ∈ N 1 3 if x = 0 1 3n+1 if x = 1 3n for and n ∈ N (d) S = (0,1) and T = (0,∞) Let f(x) = 1 x −1. MakeValid (geometry Data Type) 08/03/2017; 2 minutes to read; In this article. Fix-and-flip investors are issued a line of credit based on the value of their existing home and available equity, and can draw from that credit line over the HELOC term. There is no fix in Repair Geometry for the bad dataset extent problem. qpj (QGIS projection file) to be associated with the shapefile in order to interpret the EPSG:3857 projection correctly. how do I find and split polygons in QGIS. Amortization Problems. In the Threshold, fill with 0,5,5. To complete this task we need to implement following steps: 1. 4 (qgis-dev) in order to use the new rendering methods. Really clear math lessons (pre-algebra, algebra, precalculus), cool math games, online graphing calculators, geometry art, fractals, polyhedra, parents and teachers areas too. Chocolatey is software management automation for Windows that wraps installers, executables, zips, and scripts into compiled packages. A note about spam filters: If you don't get an email from us within a few minutes, please be sure to check your spam filter. They include ongoing assessment and course adaptation to the needs of the student. Write related words – turn nouns into verbs, verbs into nouns, adjectives into adverbs, etc. Geometry Dash. Add/Edit Virtual Layer. Using Qgis-user: To post a message to all the list members, send email to [email protected] Also, if you have a list lat/long coordinates, you can easily import this data in your GIS project. EDI Dental Supplies Sdn Bhd × in. QGIS User Meeting, June 10 2015 Geometry Cleaning Plugins Motivation > Fix errors and imprecisions in vector datasets > Improve the results of analysis operations. 3 = 21 memory upsets! This is why the computer systems on the UAV have to be radiation-hardened and the software designed to fix radiation errors when they occur. Click Compatibility tab. That's a lot of money you can save by investing some time in trying to fix it yourself. Over December, we've been highlighting 24 different features which are coming with the QGIS 3. Don't worry, Kent says Tableau is working on it. Changing locale back to my OS (German), I have a second vector menu behind the Help Menu. after a few seconds (depends on how many nodes the geometry has) you will se another message, something like. Bird's Eye View GIS | FOSS4G user/advocate/educator | Author: 'Discover QGIS' & Co-author: 'Mastering QGIS' |14ers | Good coffee | Fitness | Vinyl | Film noir. 5 Negative Binomial Distribution In a sequence of independent Bernoulli(p) trials, let the random variable X denote the trialat which the rth success occurs, where r is a ﬁxed integer. I have to fix the geometry validity issues first using the "Check Geometry Validity" tool. Unless you're a data editing jedi, your GIS data may unknowingly have errors like gaps and overlaps. Ask Question Asked 2 years, 10 months ago. The most common use for this tool is to assign a known coordinate system to a dataset with an unknown coordinate system (that is, the coordinate system is. Work with math in 800+ applications and websites! MathType is a powerful interactive equation editor for Windows and Macintosh that lets you create mathematical notation for word processing, web pages, desktop publishing, presentations, elearning, and for TeX, LaTeX, and MathML documents. This woven tetrahedron is far easier to weave than the octahedron. Posted Apr 08, 2015. JumpStart is the ideal learning environment for kids with fun educational games, activities, worksheets & lesson plans for all grades. Return to Village Math. In this tutorial we will show the complete procedure to import a Google Map layer to the QGIS 3 canvas as XYZ tiles. com gave a fantastically detailed presentation on all facets of local search. Before this 3. - risk_ltu Oct 23 '15 at 6:04 @risk_ltu - I understand, I was confused for a while when I first used GRASS :). The code compiles but the result is invalid: `json foo{ json::array. It is true that with the launch of QGIS 3 we are happy. --- Math BINGO at a glance---. Ostrowski’s classi cation of absolute values on Q 5 5. Hi all, In QGIS 3. Posted Apr 08, 2015. Here are the steps I am using in QGIS 3. The first step is to identify where the errors Read More. How To: Find the centroid of polygons using Calculate Geometry Summary. Kartoza recently published the CoGo Plugin (aka Parcel Plugin) in the QGIS plugin repository. Factors of Negative Numbers. Teachers and administrators only: Forgot User Name: Terms of Use Privacy Policy Contact Us Technical Support. Somewhere it seems around 2. Kurdish refugee wins 'Nobel of mathematics' Fields medal (Update) Kurdish refugee turned Cambridge University professor Caucher Birkar and an Italian who once preferred football to math on Wednesday were among four winners of the prestigious Fields medal, dubbed the Nobel prize for mathematics. In my experience, GRASS can work wonders for fixing these kind of issues. Our math learning solutions for middle school and high school combine consumable textbooks, intelligent 1-to-1 math tutoring software, and transformative professional learning services. Tick on "Band to Operate" and set the band number as 1 (Later change it to 2,3,4,5 for other bands). The Geometry Checker dialog show differents grouped settings in the first tab (Settings): Input vector layer: to select the layer to check. To fix this, I'll first convert the expression into a fraction in the way that any expression can be converted into a fraction: by putting it over "1". Data represented in terms of points, line and polygon. I am trying to implement a method to edit features in different geometry type. For example, in the equation "6x - 4 = 8," both 4 and 8 are constants because their values are fixed. The tool does 3 passes by default to get the average but can do more. It can be used either by individuals or on an interactive whiteboard. This tutorial will discuss how to create contour lines in QGIS. There is no fix in Repair Geometry for the bad dataset extent problem. Unlike other free online games sites, we offer a variety of classic Hasbro board games like RISK, YAHTZEE, SCRABBLE, and MONOPOLY. 99 USD on December 22, 2014 for Steam. SwAF working with geosupport in the field and in systems developement. Note the difference between the spacing around the + sign and that around the - sign. … The best feature in my eyes is the multiple projects at once feature. Solve 15 problems in 3 minutes. As I see it, the problem lies in trying to copy POLYGON features to a MULTIPOLYGON tables. Prefixes create multiples and parts of the basic units and this makes measusrement of all sorts easier. This tool uses the same logic as the Check Geometry tool, but when a geometry problem is discovered, the relevant fix (listed below) is applied. Views that use geometry functions that output other geometries will need to be cast to typmod geometries for these view geometry columns to be registered correctly in geometry_columns. The basic elements of the application GUI are similar to ArcMap's. It offers advanced network analysis algorithms that range from simple shortest path solving to more complex tasks like Isochrone Area (aka service areas, accessibility polygons) and OD-Matrix (Origin-Destination-Matrix)computation. Unless you're a data editing jedi, your GIS data may unknowingly have errors like gaps and overlaps. Allowed geometry types : to allow only some geometry types like point, multipoint, line, multiline, polygon and multipolygon. Math can be a difficult subject for some people to master. Write or type any math problem and Math Assistant in OneNote can solve it for you — helping you reach the solution quickly, or displaying step-by-step instructions that help you learn how to reach the solution on your own. A new and updated version is available at Importing Spreadsheets or CSV files (QGIS3) Many times the GIS data comes in a table or an Excel spreadsheet. The Everyday Mathematics Virtual Learning Community (VLC) provides a space for teachers to view and share resources that support mathematics teaching, communicate with other teachers about pedagogy, and take time to reflect on their practice. CoGo ('coordinate geometry') refers to its ability to handle both types of coordinates used in land surveying, namely cartesian coordinates (x,y; long/lat. At 20, it's your beat up old car. You will receive an email with a link to reset your password. My search in the plugin-tool in QGIS revealed the following suitable plugins: Geotag and import photos (needs exiftools installed 🙁 ). Free shipping. Free math lessons and math homework help from basic math to algebra, geometry and beyond. Fix issue with icon not showing in toolbar (#18) 3. This time, using topology checker and automatic correction is not suitable. The Rotational Symmetries of the Cube. 0 licence (CC BY-SA) Select graphics from The Noun Project collection Textual error, missing text or you know better: fix me. This workflow can be especially useful when an Advanced/ArcEditor license is not available and the Feature to Point tool is inaccessible. XtraMath is a free program that helps students master addition, subtraction, multiplication, and division facts. Harvard CGA QGIS 2. How fast can you go? Practice multiplication facts and win the Grand Prix. But since anything can also be regarded as being multiplied by 1, I'll leave a 1 on top. Welcome to the fractions worksheets page at Math-Drills. Negative area. To see the collection of prior postings to the list, visit the Qgis-user Archives. Fix-and-flip investors are issued a line of credit based on the value of their existing home and available equity, and can draw from that credit line over the HELOC term. Welcome to Bright Ideas, the e-newsletter of Illuminations. 0 Nodebo version of QGIS. While very little is known about the neurobiological or environmental causes of these problems, many experts. Spatial databases optimize management by allowing various spatial and non-spatial data types to be stored and manipulated in a single file. 4 just released. The Math 7 (3. Free math lessons and math homework help from basic math to algebra, geometry and beyond. PlanetMath's content is created collaboratively: the main feature is the mathematics encyclopedia with entries written and reviewed by members (subject index, alphabetical index). There is no fix in Repair Geometry for the bad dataset extent problem. Choose Geometry Type, or No Geometry. The window of v. advanced will appear as in figure 3. Note: If you share your computer with other people and don't want them to log in to your Facebook account , read How do I share Firefox between people on a computer?. This latter is deﬁned, for 4 vectors X= (X. Fix It! encourages students to immediately apply new grammar knowledge in context, aiding in the transfer of grammar skills into their own writing. Throughout the first nine sessions, you will explore the properties of geometric figures, make constructions using pencil and paper and dynamic software, practice using mathematical language to express ideas and justify your reasoning, and begin to explore the basis of formal mathematical proofs and solid geometry. Nowadays, the speed of light in vacuum is defined to have an exact fixed value when given in standard units. x choice from the QGIS folder in your Start menu. Norton Safe Search is a search environment developed with focus on online safety. MakeValid (geometry Data Type) 08/03/2017; 2 minutes to read; In this article. On a sphere, points are defined. 00 y at the center of your map window which = no where in particular. Here you can find interactive games designed to make math drills fun and entertaining. **Geometry expressions** * **extend(geometry, start_distance, end_distance)**: Extends linestrings by a specified amount at the start and end of the line * **hausdorff_distance(geometry a, geometry b, densify_fraction)**: Returns the Hausdorff distance between two geometries. This page contains links to free math worksheets for Fraction Subtraction problems. Math crossword puzzles make it fun for students to review addition, subtraction, multiplication, and division. After five consolidation point releases (3. Below is a snippet of code that is functionally equivelent to math. Used by over 7 million students, IXL provides unlimited practice in more than 4,500 math and English language arts topics. ExploreLearning Reflex helps all students succeed. Point-slope refers to a method for graphing a linear equation on an x-y axis. But before we are discussing about drawing contour lines in QGIS, let's start talking a little bit about the concept of contour line, what contour line definition is, contour lines characteristics and and how the method in drawing contour line. qgis2img will render each image by itself to give single timings then it will render the whole project as you see in QGIS. a solid object. CoolMath4Kids - Math and Games for Kids, Teachers and Parents. round except that the snippet of code below is slower than Math. Drop Geometry on the. Find and fix missing skills with personalized learning, pinpoint assessments, and motivating rewards. I came across this issue when trying to use simplify on a polygon layer. A: After adding - find this service in QMS for QGIS and place a mouse cursor over the service in the search panel. Simple addition word problem worksheets. The greatest QGIS release ever! QGIS 3. GPKG) to know why QGIS 3 made this. How to evaluate trigonometric ratio of angles using a calculator, how to use a calculator to find the trigonometric value of an angle, examples with step by step solutions, SOHCAHTOA using a calculator, How to find function values for sine, cosine, tangent, cosecant, secant, and cotangent. As do my early gen3’s And most my newer gen3’s Only had a few newer gen3’s Do the brass to the face. In my last blog post, we improved a dataset containing all municipalities of Norway by merging polygons in QGIS. Invalid geometries can cause a lot of headache: from missing features to odd analysis results. Sections of this page. The QGIS OpenStreetMap Plugin is a plugin for the desktop GIS application QGIS. 5 (Tosses of a fair coin) We make N = 1000 tosses of a fair coin and denote. When the shapefile is not clean, the "Dissolve" tool in QGIS doesn't seem to work, it freezes. There was a lack of a JSon array around rings of a polygon. Funding for Cyberchase is provided by The JPB Foundation, the National Science Foundation and Ernst & Young LLP. A constant in math is a fixed value. If there is geometry, Choose X and Y fields, or WKT field. It helps push certain multiplication facts into long-term memory, by associating them with strong emotions - the excitement of the game,. Views that use geometry functions that output other geometries will need to be cast to typmod geometries for these view geometry columns to be registered correctly in geometry_columns. LOGIN New to Big Ideas Math? LOG IN. 🙂 He also gave me a good tip. The more daring began to leave behind the standard geometric way of thinking in which linear (first power) variables corresponded to lengths,. Get a centroid in QGIS via python. XtraMath is a free program that helps students master addition, subtraction, multiplication, and division facts. There is a bug in the 2. Understanding extrusion width. LANDSAT-7: QGIS 1. Fun Addition Games for Kids. Usually a crash in lwgeom is a misalignment (dirty installation) problem in the loaded or shared object. how do I find and split polygons in QGIS. This bug hides some vector processing tools (GDAL tools) found under the "Vector" menu. Add PostGIS data to QGIS. To resolve this problem, run the Recalculate Feature Class Extent tool on the dataset. The result of executing this math expression in Java is 72 (rounding of calculations affect the result). x choice from the QGIS folder in your Start menu. HOW TO SET UP AUTOMATIC UPDATES. Select and calculate area, length and perimeters of features. 3 Problems with Math Fluency and How to Fix Them I cannot remember a time when teachers were pleased with their school's record of success with mathematics fluency. Once a month, this newsletter provides resources, information and new ideas to interested teachers. Also the change to QT5/PyQT5 and Python 3 are noteworthy. Donald Trump warns that 650 million immigrants could come to the U. 3 Functions That Create Geometry Values from WKT Values. My gen5’s all toss brass hard to the right from my 19x to my new gen5 17. Note that you’ll need a recent QGIS release for this to work correctly — either QGIS 3. Other projects will be welcome to add their own example exercises as well. circularstring, compoundcurve, curvepolygon ). 5 (62 ratings) Course Ratings are calculated from individual students' ratings and a variety of other signals, like age of rating and reliability, to ensure that they reflect course quality fairly and accurately. This plugin expands the group of plugins designed to manage SDI (Spatial Data Infrastructure). Ask Question Asked 3 years, 5 months ago. Inverse limits 10 7. 4 is a relatively simple and straight forward process. Compatible with all browsers, iPad and Android. The grid manager is the most flexible of the geometry managers in Tkinter. 3) If this is the first time you have downloaded the app, tap Free. between upsets would be about 6. Math Jokes and Riddles for Kids at EnchantedLearning. Contained in this site are the notes (free and downloadable) that I use to teach Algebra, Calculus (I, II and III) as well as Differential Equations at Lamar University. Here are the steps I am using in QGIS 3. These instructions describe how to find the centroid of polygons using Calculate Geometry within the attribute table of a feature class. Solve 15 problems in 3 minutes and win an award. Some plugins will let the user edit already preset geometric features using plain text in the WKT and WKB formats or even draw them on new maps. HOW TO SET UP AUTOMATIC UPDATES. Two practical applications of the principles of spherical geometry are navigation and astronomy. The pencil line is just a way to illustrate the idea on paper. o The value of a Geometry object's "type" member MUST be one of the seven geometry types (see Section 1. Let f be a given image represented as a m r by m c matrix of integer pixel intensities ranging from 0 to L − 1. 4 Sponsor AGI Kanton Solothurn, Switzerland Summary A basic requirement of many GIS enviro. Free math lessons and math homework help from basic math to algebra, geometry and beyond. Trending at $3. The purpose of the snippet of code below is to demonstrate how Math. 8 brings a highly-desired fix to layer effects' blurring radius (aka strength). Double click Computer icon on Desktop. 8 has already been released, we invite you to try it. Finding and fixing geometry problems. to kill, harden, and preserve for microscopic study. It is called Feature Filter and available in the processing modeler. A new and updated version is available at Importing Spreadsheets or CSV files (QGIS3) Many times the GIS data comes in a table or an Excel spreadsheet. So I'm assuming you've given. These functions cannot be used with complex numbers; use the functions of the same name from the cmath module if you require support for complex numbers. Now we are making the selection of feature ("lock") available again - using right click. The rules are so simple, but force players to quickly analyse a number in several different ways. I'll try to fix that but the qgis canvas will be replaced by Martin's code soon anyway. The answer must be rounded off to 3 significant figures, since 45.