All Questions

I'm a new javascript coder I need you help. I'm adding a mouse move to my map using openlayes but it's not working to display coordinate in my mouse. 1- the first step I wrote this code in my js ...

I'm currently working on creating a weather map system with leaflet. I'm using grads to create KML files from NOAA/NCEP GFS data in grib2 format. Grads seems to be only able to write out one layer pro ...

I am studying a paper where they use a method to calculate the vertical distribution of water content (ice, water vapor, cloud water) from the amount of ice on the martian surface. In the paper they ...

I started recently working in a project where I need to start using EPSG codes to identify coordinate systems and their elements. I saw that a single EPSG code can identify multiple objects. I am ...

In a PostGIS enabled DB, I have a 1.7GB table with a raster column rast. I need to create an index on that column in order to speed up my raster queries. I have tried the following: CREATE INDEX ...

I need to find the best complaint spatial JavaScript library with OGC protocols and I have done a quick research. I don't pretend to be as exhaustive as in this post: comparing-various-javascript-...

is it possible to set a field in QGIS to "required" using PyQgis? The user should select a value from a valuemap in my plugin. If he has not selected a value, he should not be able to save the object. ...

Running "mapbox-gl": "^0.53.1" I want to update the color of a layer "type": "fill-extrusion" This is not just one feature that I select, but it might be a multitude of features that are altered (...

I am researching various GIS data sources for London (UK). I was wondering whether anybody can give me pointers of how to get planning and policy restrictions - i.e. data that shows what you are ...

I have converted my data into CSV and tried following instructions on how to translate that onto a map but my points/data wont load. Does anyone have a solution to what could be wrong?

I'm trying to compile MapServer 7 with: Proj 6 Geos 3.7 Gdal 2.4 PostGis 2.5 Postgres 10 But for some reason it complaining about pg_config not found, I usually insert the path /usr/pgsql-10/bin/...

I have a leaflet map where I want to get wikimapia POI and data inside my map so I could identify some Points of interests and informations which are in wikimapia ,I have a wikimapia kml that loads in ...

I applied image segmentation algorithms(KMeans, GMeans, SNIC) to SAR image. SNIC shows Good result, But, KMeans (ee.Algorithms.Image.Segmentation.Kmeans) and GMeansKMeans (ee.Algorithms.Image....

I have installed a fresh QGIS version via the setup tool (you will find the version infos in the attached error message). All GRASS tools are causing this error: QGIS version: 3.6.3-Noosa QGIS code ...

I'm aware of GDAL libraries but am supposed to not use them. Is there a way to use mmap or memory mapped files to access the specific longitude, latitude and elevation values from a .DEM file? The ...

I have a set of 32-bit TIFF files of DTM data (50 sm) and I need to save them as 16-bit. In order to save some space, I compressed them using LZW algorith and saved as 16 bit tiffs using Arcpy. But ...

My problem with QGIS (version 3.4.8) I have a .shp map layer containing point data of buildings. I want to join .csv spreadsheet to this layer so I can look into it and visualize different variables ...

How do I get the route planner linked to current and past traffic (for example API Google Maps) in QGIS?

I want to split/cut polygon into 2 polygons by line.I am using PostGIS ST_Split functionality.Below is code tried so far with reference,passing two edge point coordinates creating line, by that line ...

I performed IDW for EMF levels from cell phone towers. The resulting Mean Prediction error is -0.0078. What does this negative sign mean?

When I check for overlaps, topology checker is only identifying errors at the polygon level but not the polygon segment where the errors exist (the whole polygon is highlighted in blue). I believe ...

Im using Nominatim 3.3 (https://github.com/mediagis/nominatim-docker/tree/master/3.3) within docker. I already imported succesfully 2 regions (not together, my PostgreSQL database contained one region ...

I'm having a shapefile which I want more than two users to work simultaneously from different location on that file. What the easiest way to do this? PostGIS Database? QGIS clients? Or any ...

There is a closed question which is similar to or identical to this question: Getting date modified for a feature class within a file geodatabase via arcpy Looking at a file geodatabase featureclass ...

As model input data I select a raster stack with three bands. The first processing tool just needs specific bands of this stack which I like to select in the input dialog. I create a 'Raster Layer' ...

When I want to install ArcGIS for server 10.3, there is a error: 0x80004001 - Reference to undefined entity 'nbsp'. in 'msxml3.dll' I had ArcGIS server 10.2 before installing this version. I ...

I have a hundred pairs of CSV data such as passenger and bus stop data. The passenger and bus stop data structure are ID passenger, bus stop name, and XY coord (UTM). I want to analyze the nearest ...

I have used simple interpolation method to apply on the my data but there are no change on my prediction map. What should I do?

I have been trying to create an .asc file that contains the difference between two others. This can be represented as C=A-B. All files have the same size. When using the Raster Calculator built into ...

I want to use a script to do some raster calculations. I found this and this posts which seem to answer this question, however, it seems that they work for QGIS 2 and not for QGIS 3. I think the ...

Let's say I have a geofence polygon with the following coordinates POLYGON((-36.861986 174.726745,-36.859241 174.730442,-36.859821 174.730976,-36.862321 174.728156,-36.861986 174.726745)) I'd like ...

Ill start out by just explaining what I'm trying to achieve. I'm running an arcgis application based on the javascript API. I'm Rendering a CSVLayer into my SceneView like such: require(["esri/Map", ...

I am doing research at graduate school. Using QGIS GRASS, I made a raster image (DEM) by spline interpolation from point data. Next, I decided to limit the range to within the vector (within the point ...

I want to combine Landsat bands with the backscatter coefficients of ALOS PALSAR. I used the following code to resample and combine. However, the HH, HV bands in combine image showed with 'masked'. I ...

I am really struggling with migrating a custom plugin from QGIS 2.x to 3.x. Below is a code snippet that seems very straightforward, but I can't find documentation that I understand for setSourceCrs()....

I am having trouble properly displaying my .shp layers in UTM (QGIS 3.6.1). Whatever I do, the coordinates always display as lat/ long, and measurements are way out. I have re-saved all my .shp layers ...

I have a problem with MapServer and I do not know much about it. I'm painting a map but my problem is that I do not paint the layers in both KML and KMZ the code I have is..... MAP CONFIG "...

I've recently installed QGIS 3.4. Earlier today, my vertex tool showed a virtual node at the center of line segments (as it should with the new node tool). This is no longer showing while editing the ...

This is kind of a two-part question to see which route would be more efficient. I'm trying to display a label in a shortened version, but the info is all in one column: Township 1 South Range 20 ...

I uploaded a shapefile in GEE and want to make a list with the polygons within it, in order to load Landsat 8 images that fit within the polygons. I did the FilterBounds operator, loading a Landsat 8 ...

I input a number of raster bands into the Iso Cluster Unsupervised Classification tool and asked for 5 classifications and specified a signature file to be created. The tool ran for a while and then ...

I have a CSV file that I imported into Google Earth Pro. G.E.P. took the long/lat and placed markers where they should be, and when I select the marker the rest of the data displays in a box. Is there ...

For some reason I lost my previous question here but I proceeded a little bit after upgrading to the newer version of QGIS. My problem was combining spreadsheet .csv data to the .shp map layer, where ...

I do have a point layer (data from a GeoJSON) and a polygon layer (also GeoJSON) in Leaflet. Both layers are created the same way and I made both layers "non-interactive". Unfortunately the point ...

I am trying to re-project a NetCDF file to a uniform grid EPSG: 4326 and convert it to a TIFF file. However, after the GDAL re-projection the values in the file change, i.e. the values are not ...

I am using VLP32 Lidar, with ROS and Autoware running in background. I need to get the geocode of the points in pointcloud. The Lidar is not configured with a GPS as of now, so the GPS fields in Velo ...

I'm using the code in this example to create a GeoJSON polygon file. When I just use that code it works, although I would like to add values to the properties of each feature. When I try this it gives ...

I want to download MODIS data from http://glcf.umd.edu/data/lc/ It is stated in the website : Download 5'x5' via FTP server, when I click the FTP server it gives me a "This site can’t be reached", is ...

I have an attribute table with a date field and a random field. The date field has three different times for each day. I need to input a '1' in the random field for one of those three times in each ...

I want to submit a paper for some research that I have done. What are the top conferences and journals in this field?