Python-OGR: nested loop only loops once
Geographic Information SystemsWhy is my while loop only running once Python? A while loop might not even execute once if the condition is not met. However, do-while will run once, then check the condition for subsequent loops. Is there a limit to nested for loops Python? While there’s Python has no technical limit to understanding complex a
How to calculate the number of points with differing characteristic in a polygon in ArcMap?
Geographic Information SystemsHow to count the number of point features within a polygon in ArcMap? Open the attribute table for the join output, and look for the Join_Count field. The number in the field represents the number of point features within the polygon, which in this example is the number of earthquakes that occurred in Indonesia. How
Adding M values to a shapefile so the distance along the line is displayed as a derived attribute in QGIS
Geographic Information SystemsWhat are M values in Qgis? M-values are routing values. Z-values are elevation values. How do I extend a line in Qgis? Quote from video: So this is how you use the extend. And dream feature in qgis. If you know how to work with it it kind of do gives you good results and
Creating vector file using QGIS
Geographic Information SystemsHow do I vectorize an image in QGIS? Click on Raster ‣ Conversion ‣ Polygonize (Raster to Vector). The tool dialog will appear. Change the field name (describing the values of the raster) to suitable . Save the shapefile under exercise_data/residential_development as all_terrain. How do I create a vector polygon in QGIS? Quote from video:
‘NoneType’ object has no attribute
Geographic Information SystemsHow do I fix NoneType has no attribute? The Python “AttributeError: ‘NoneType’ object has no attribute ‘get’” occurs when we try to call the get() method on a None value, e.g. assignment from function that doesn’t return anything. To solve the error, make sure to only call get() on dict objects. Here is an example
Importing raster files in GeoPackage
Geographic Information SystemsHow do I add raster to GeoPackage? To save a raster, right-click on the raster layer and go to Export | Save As….Merge your series of rasters before saving them to a GeoPackage. Change the Output mode to Rendered image. Change the Format to GeoPackage and then set a File Name and Location for the
How to display Google Maps as basemap in a Silverlight application?
Geographic Information SystemsHow do I integrate Google Maps into an app? Let’s see how to create a new project and integrate Google Maps. Install the Google Play Services SDK. Add Google Play services to Android Studio. Create a new Google Maps project. Get a Google Maps API key. Check your code. The XML layout file. The maps
Display Map Tips in QGIS
Geographic Information SystemsHow do I show map tips in QGIS? You need to click on the map tips button or goto View->Map Tips in the menus. How do I enable map tip? MapTips will only work in data view. Right-click the layer for which you want to display MapTips in the table of contents and click Properties.
Analyze Datasets (Data Management) – what is the output?
Geographic Information SystemsHow do you analyze a data set? 6 Steps to Analyze a Dataset Clean Up Your Data. Identify the Right Questions. Break Down the Data Into Segments. Visualize the Data. Use the Data to Answer Your Questions. Supplement with Qualitative Data. How do you analyze large amounts of data? For large datasets, analyze continuous
ArcMap 10.3 Mosaic to New Raster produce a single color output
Geographic Information SystemsHow do I convert Mosaic to New raster? Open the Mosaic To New Raster tool by navigating to ArcToolbox > Data Management Tools > Raster > Raster Dataset. Insert the raster files. Select the output location. Specify a name and extension for the output. Specify the pixel type. Specify the number of bands. What