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I need to calculate the distance between points of two different datasets, once with locations of towns, the other with locations of dams. Both are located in different countries in Africa. The more I read the more confused I keep getting. I'm using the Python ecosystem (Geopandas, Shapely...

I have a server running Geoserver 2.8 with the ArcSDE extension installed. I have added a new "ArcSDE ESRI(tm) ArcSDE 9.2+ vector data store" with credentials from our DBA. When I try to add a layer I only see a tiny subset of the layers that should be there. Talking with the DBA it appears the...

After installed QGIS 2.12 I don't have SAGA in Processing Toolbox anymore and I need it bad. Am I blind, can't find it or something went wrong? Any suggestions please?My OS is Win 7 65 bit. أكثر...

It seems the transition from OL2 to OL3 will be harder than I thought. There are significant differences and the online support its still limited (regarding examples etc.) I am trying to do something relatively simply..to display a WFS layer on my map using OpenLayers3. I have found this...

In our Office we use pre-defined, read-only .mxd Projects. For saving edited projects I made a little python Add-in which allows the user to save the mxd in a subfolder of a Default-path, which is selected by the user with the pythonaddins.SaveDialog. My Problem is, that I can't implement the...

For a small project we are using leaflet with geojson features instead of openlayers backed by geoserver. Now, when I click in the map, I want to see a list of all features in that position. I use the onEachFeature to attach a popup to all visible features (in separate layers), but not...

This webinar explains design strategy and workflow used to observe agriculture growth using free imagery from Landsat 8 data continuity mission. أكثر...

To all of you who celebrate this great holiday, Happy Thanksgiving to you and your family from the Lidar News team. We will not publish tomorrow, but we’ll be back on Black Friday.Thanks to all... Click Title to Continue Reading... أكثر...

I'm trying to create a custom Polygon style for my layer style. I receive some information about position, orientation and age for a number of objects and I want to represent those as zoom independent (like using Icons or RegularShapes) isosceles triangles, pointing at an angle and color-coded...

I meet a problem while I try to calculate the length of a polyline in QGIS in the attribute table. I created a new column with the function "$length" inside (type: real, 10 digits and 3 digits of precision). My projection is WGS84. My problem is that the result is completely wrong!! For...

I am developing a PostGIS query to sample rasters using a point table to detect land cover change. I have read the documentation on ST_value and I am able to get the raster value of a single point using the following query: SELECT rid, ST_Value(rast, 1...

I made the following in advance: I aggregated population data to 100*100m Grids. Afterwards I wanted to find out, weather there is autocorrelation in the data or not. For this I applied the Moran's I on different distances (142m, 284 m etc.). My problem is, that I get as a result extremely high...

Code with issue on Codepen - Having successfully integrated the OpenRailwayMap API into Leaflet, I wanted to use OpenLayers instead and followed the API instructions, but am getting an error: " Cannot read property 'XYZ' of undefined". Can anyone see the issue here? أكثر...

I am about to import a raster (.tif with 50mb, size 3301x21676, pixel size 10x10) into postgres with raster2pgsql. With small extracts of the image it works but ... raster2pgsql [myfilename].tif -F [somename] > [somename].sql My problem is that I end up with a huge sql file (about 1...

I am looking for a way to implement conditional value mapping in QGIS. This means that the values available in attribute number 2 depend on the value provided in attribute 1. Example: If the user enters "agriculture" in attribute 1, for attribute 2 only "corn" or "wheat" will be available...

In the following line, I don't understand what those exclamation marks mean? And why put everything in quotation? I don't understand the purpose of the variable expression, please explain to me as I'm new to python expression = "crossing(!CROSS_ROW!,!ROW_SCORE!)" codeblock = """def...

I want to measure surface volume of an area in different elevation layer. For measuring the surface volume I have to make a Polygon Volume as well. I have problem with making this polygon over the TIN layer and define the different elevation for it ? Like the link below...

I've got a regular polygon file that looks like this: Unfortunately, this file stems from a v.overlay so that the 'cat' values are are a bit messed up. I would like them e.g. to start in the upper left corner and increase from left to right and top to bottom. How is that possible?I already...

Sorry folks, we recorded Episode 532 as usual, then I forgot all about it due to a busy holiday week (aren’t they supposed to be relaxing or something?). As soon as I get a chance (Thursday night?) I will try to get the episode up. I deeply apologize for the delay. Jesse أكثر...

I'm trying to compile the qgis project and I have an error because of the Qt In the first pic you can see that i installed the Qt4.... In the "QT_QMAKE_EXECUTABLE" row I've tried: C:\Program Files (x86)\CMake\share\cmake-3.0\Modules\FindQt4.cmake...