All Questions

I have a GeoTiff in QGIS that I created by merging some images inside QGIS. It looks like this: I use Raster>Conversion>Translate. And save it as a PNG. I then open the image in both, Photoshop ...

I have just installed the LTR version of QGIS (3.4.10) and am having trouble telling QGIS when I have finished a polygon. In fact, I can't. It used to be in earlier versions that to end a polygon you ...

I am trying to use the 'ident' authentication of for local PostGIS (2.5) server, so that each user can connect to his/her account without having to provide password. The local connection (to 127.0.0....

I would like to start by saying that I am very new to this. I have 160 different points which all have similar layout as below: at point | X= 153346.357 | Y=354912.111 | Z=0 | Doing some research I ...

I am trying to smoothen my raster stack using Savitzky-Golay method. I am following the workaround from HERE but my problem is setting start and end of my time-series raster. My series of images were ...

I want to rasterize an ENC I downloaded from NOAA (https://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml) in order to have a XYZ grid of sounding depths. I should think this is an easy process, ...

Fairly new to ArcMap 10.3, I'm trying to find a method to build a toolbox model to determine the area of flooding within a basin. The tricky part is that I need to remove the flooding within a pond. ...

Just uninstalled Desktop & Python27 folder and did full re-install. Still having this problem where ArcMap crashes when calculating fields, trying to open Geoprocessing Tools or Toolbox. Probably ...

I am working on QGIS with a shapefile: I transform it through Raster-> Conversion-> Polygonize Then I eliminate some parts (Sea), and those that are bigger than one single square of grid but are ...

I have a line table and a points table in PostGIS. I need to split the line table with the points table and return all geometries. Tried... CREATE TABLE lines_split AS ( SELECT a.seg_name, ((ST_DUMP(...

I am trying to get a text element to input an address using the below code. It seems that the code picks up the right elements, is finding the text elements I want to change but isn't able to actually ...

I'm new to QGIS and I wonder whether there is a tool that helps to adjust the edges between two or more polygons; similar to that topology tool that's used in ArcGIS. http://desktop.arcgis.com/en/...

Does anybody know if Qfield can run on Ipad? My understanding is it was build to run on Android 4.3 or later version. Anybodu knows if it can run on with IOS?

I'm struggling to use ogr2ogr to convert a GML file into a GeoJSON file. My input is zipped GML files with several layers. I'm only interested in the layer with name 'TopographicArea'. I've tried ...

So, it appears that I can rename a store name (both DataStores and CoverageStores) from the WebUI (v2.13.2 and 2.15.2) but I cannot do it via the REST API. It returns a 403 error when I do this: curl ...

Here is an example code that I use in my work. There are a few issues with this: The layer title appears one more time in the legend of layerlist. How can I remove it or change to other text? ...

Given a timestamped start location, a timestamped end location and a known average speed is there any way I can map everywhere someone (or something) could have possibly been between the two ...

I have a tiff file with some values and I want to read those values and plot a CDF (Cumulative Distribution Function). So far I only know how to get the mean value from osgeo import gdal gtif = gdal....

I have a parcel feature class with +5M features. I want to spatially join it to a feature class of regions to check if the regional code matches that in the parcel data. I've tried using "have their ...

I have Coordinates (x=3381438.573, y=5794542.432) and a location (somewhere south of Berlin). Is there a way to find out the Projection code this data was defined with? A website would be nice.

I have multiple feature classes (buildings, airport, land, roads etc) that I would like to clip using a Local Authority boundary. I am trying to create a process in model builder or Arcpy that will ...

I am trying to create 3D maps. I am using QGis2threejs. I know I can also create a 3D map using 'New 3D Map View', but I want to try QGis2threejs. However I have two questions. When I install the ...

I prepared a map with a custom legend on QGIS 3.8.1, combining a classification of several concatenated fields. However, when creating the layout compouser and including the legend, the descriptive ...

I have a vector layer with Multilinestrings and used the field calculator to add a field ("length") with the calculated $length of each feature. I know the field values are correct. Now, if I ...

This code works in Earth Engine Code Editor, but it doesn't work in my server-side web app. I get Error: Unrecognized argument type to convert to a FeatureCollection: [object Object] //inputs is ...

My boss is collecting data which measures where visitors to our website are located. He wants me to make a choropleth map (I believe that's what it's called) in which countries and provinces are ...

How can I convert multiple points to multiple (tiny polygons)? I need to execute a merge function and I need the points to be polygons so that the toolbox can do its job and join multiple polygon ...

I sampled a population of an insect in an area and got GPS points. Now I want to investigate if there are subpopulations within the pop using distance from points. I have a dataset with coordinates ...

I want to introduce geotiff images generated in QGIS by clipping ortho imagery to a shapefile into matlab. However, the clipped raster images come with black borders. I managed to remove them in QGIS (...

I am using Python geopandas and I have two shapefiles. One of them is a grid file containing equal polygons. The other shapefile is a linestring file with several lines and its Attributes. The idea ...

I can not find a solution to resample my rasterfiles in QGIS 3. With Arcmap usually I use "resample while drawing" with the method cubic or bilinear interpolation for continuous data to smooth my ...

How to find a duplicate point geometries in point shapefile (around one lakh geometries) using Python OGR/GDAL

What is the best way for atmospheric correction on Sentinel 2 images with ENVI 5.3?

I have a raster world map of population densities at a resolution of 30 arc seconds. For each raster, I want to find out the average density of neighbors within a certain distance (e.g. 0.1 degrees). ...

We suddenly have problems visualizing ArcGIS Online WebScenes in Google Chrome (Version 76.0.3809.100 (Official Build) (64-bit)) and I am wondering if we are the only ones, as some searches returned ...

I have used QGIS2threejs for several years in QGIS2. Now we have upgraded to QGIS3 at work and the plugin no longer works. The qgis2threejs window is blank and it displays the error “Any 3D objects ...

I have a point Shapefile with unsorted feature ID's (FID). I want to convert the same point file into polygon Shapefile by using python gdal/ogr. I got the help from link1 and link2. I'm able to make ...

I have a raster with values in each pixels. I need to change each pixel by the average of surrounding pixels. For example in the first row first column , the pixel value will be replaced by average ...

I'm trying to clip a google satellite XYZ tile over a layer mask of my DEM layer to make a 3D map. the problem is that after making the connection and adding it as a layer to my project, im unable to ...

I have a TopoJSON map of China which is working well in d3.js. However, it is essential that I add Hong Kong, Macau/Macao and Taiwan to the map, but they are not included in the TopoJSON file. I have ...

I need to move my polygon (region of geographical area) with 4 different (O1, O2, O3 and O4) lat-lng coordinates (as shown in the figure) to another place, so that I get new values of all 4 lat-lng ...

I've seen the questions and answers about ST_Azimuth, but didn't find a specific example for this case: I need to calculate the azimuth from point id 1 to id 2, id 2 to id 3, id 3 to id 4, ... Table ...

I am trying to get an image from inside a polygon. TLDR; What I am trying to do: save what's inside a polygon as an image. What is happening now: I am only able to save the canvas as an image. ...

I want to create a series of plans at a set scale that covers a large area defined by a polygon. The polygons are a buffer for a water network, so is very irregular with sections that are long and ...

My organisation restricts admin privs on our machines, which means that installing OSGeo4Win would require a tech to come out (and as they're stretched pretty thin and I'm likely to need regular ...

My company uses QGIS 2.18 (soon to upgrade to 3.4) and I've designed a form to make data entry for our survey field staff a little less hateful. The .ui file is saved on a network drive, and as long ...

I'm trying to iterate on some buffer distances in ModelBuilder, and I want to be able to set the units in ModelBuilder. I have numeric (double or long) "multivalues", and I can connect the output of ...

I have a GeoPackage that is downloaded to client devices for a mobile app. I need the clients to query the GeoPackage to retrieve a GeoJSON representation of the geom column. I'm familiar with ...

Is there a way to create a KML or KMZ file using the iOS Google Maps app? I’ve created a map on Google My Maps but can’t find a way to export it on Google Maps. I’ve tried the iOS app and the Google ...

Is it possible to project EPSG: 6350 (NAD83 (2011)) as WKID: 102039 (USA_Contiguous_Albers_Equal_Area_Conic_USGS) in QGIS? There is no EPSG code and I'm unsure how to create a custom CRS.