on December 25, 2022
Creating hole in polygon while using ‘auto complete polygon’ in ArcMap?
Geographic Information SystemsHow do you make a hole in a polygon? A hole in a polygon feature is a part of a multipart feature. To create a hole, finish the primary part and sketch the hole. Alternatively, you can split the feature and delete the part, or clip a hole using an existing overlapping feature. These tools
on December 25, 2022
Symbolising options for ArcGIS Online?
Geographic Information SystemsHow do I add symbols in ArcGIS online? Create your own Style in ArcGIS Pro Double click on the new style and right click in the new style and click on New to create a new symbol within the style. You can also click New Item in the ribbon to add the point symbol. Can
on December 25, 2022
Integrate Google Street View into Openlayers3
Geographic Information SystemsCan I use Google Maps with Openlayers? Unlike Bing Google does not allow its map tiles to be used directly in Openlayers, and you can’t use OpenLayers code in the Google maps API so you would need to rewrite much of it. However, it is possible to use javascript to place an Openlayers map and
on December 24, 2022
Encoding categorical variable for random forest with sklearn
Geographic Information SystemsHow to encode categorical data for random forest? 1. Data Preprocessing Check NAs. Split the data into X and y. Create training and validating set. Create list of categorical variables to encode. Create a constructor to handle categorical features for us. Can sklearn random forest directly handle categorical features? You can directly feed categorical
on December 24, 2022
Position from LLA to NED and vice-versa
Geographic Information SystemsWhat is LLA coordinate? Latitude, longitude, altitude (LLA) coordinates as M-by-3 array of geodetic coordinates, in degrees, degrees, and meters, respectively. Latitude and longitude values can be any value. However, latitude values of +90 and -90 may return unexpected values because of singularity at the poles. How to calculate latitude and longitude from easting and
on December 24, 2022
Using python gdal.BuildVRTOptions()
Geographic Information SystemsHow to use Gdal_merge in Python? Place each input file into a separate band. Grab a pseudo-color table from the first input image, and use it for the output. Merging pseudo-colored images this way assumes that all input files use the same color table. Ignore pixels from files being merged in with this pixel value.
on December 24, 2022
Does not accept in raster calculator variable s the number QGIS
Geographic Information SystemsHow do I change raster values in Qgis? Quote from video: And the raster. Calculator. If i come here and click on that double click on that and it's here i said for example anywhere is this zero and create on fly. And click ok so here is a is a condition. How to do
on December 24, 2022
Direct DBMS sql queries and ArcSDE geodatabase
Geographic Information SystemsWhat are the two types of queries that use SQL in ArcGIS? There are two types of queries: attribute and location. Attribute queries ask for information from the tables associated with features or from stand alone tables associated with the GIS. Attributes can be numeric values, text strings, Boolean values (i.e., true or false), or
on December 24, 2022
Show only polygon of interest in Atlas, QGIS
Geographic Information SystemsHow do I hide a polygon in Qgis? in the shapefile properties (doubleclick on the shapefile) select properties>style>categorized> select the “visible” column, and click on ‘classify’ EITHER delete the “no” records from the style dialog window. OR uncheck their visibility checkbox. How to use Atlas in Qgis? How to Create a QGIS Atlas Mapbook Add
on December 24, 2022
Combining multiple DEMs into one file geodatabase
Geographic Information SystemsHow do I combine multiple DEMs? Note: Start ArcMap. Load the DEMs files you want to filter. On the main menu, click Customize > Toolbars > Production Contouring. Click the Merge And Filter DEMs button. on the Production Contouring toolbar. Click Merge Only in the Operation area. Click the Open button. Navigate to a current