All Questions

0
votes
0answers
3 views

adding mouse move to my map using open layers

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 ...
0
votes
0answers
6 views

Create KML “animation” / time domain from separate KML files

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 ...
1
vote
0answers
9 views

Understanding cosine-weighting?

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 ...
1
vote
1answer
10 views

Same EPSG code for different objects

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 ...
0
votes
0answers
11 views

Creating Index on raster column? [on hold]

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 ...
-1
votes
0answers
12 views

OGC protocols in JavaScript libraries [on hold]

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-...
0
votes
0answers
14 views

QGIS Required Edit Field

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. ...
0
votes
0answers
4 views

Mapbox GL Feature Manipulation

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 (...
-1
votes
0answers
11 views

Seeking policy restrictions data for London, UK?

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 ...
0
votes
0answers
11 views

Exporting data to map? [on hold]

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?
1
vote
1answer
9 views

MapServer 7 PostGis/postgreSQL support

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/...
0
votes
0answers
18 views

Getting wikimapia embeded in Leaflet map?

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 ...
-1
votes
0answers
8 views

Image Segmentation Algorithms (KMeans, GMeans) on Google Earth Engine doesn't work [on hold]

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....
-1
votes
0answers
16 views

QGIS - Grass tools are not working properly

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 ...
0
votes
0answers
6 views

Reading elevation data from DEM files using memory mapped files?

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 ...
0
votes
0answers
7 views

Performing DTM compression using ArcPy?

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 ...
0
votes
0answers
17 views

Joining .csv with duplicate values to .shp layer with points and getting all points visible using QGIS?

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 ...
0
votes
0answers
12 views

Route planner QGIS [on hold]

How do I get the route planner linked to current and past traffic (for example API Google Maps) in QGIS?
2
votes
2answers
34 views

PostGIS ST_Split is not working

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 ...
-2
votes
0answers
18 views

What does a 'negative sign' for Mean Prediction Error for IDW mean? [on hold]

I performed IDW for EMF levels from cell phone towers. The resulting Mean Prediction error is -0.0078. What does this negative sign mean?
3
votes
0answers
11 views

Topology checker - whole polygon highlighted rather than polygon segment

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 ...
1
vote
0answers
16 views

Error when importing merged osm.pbf files into nominatim's PostgreSQL database

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 ...
0
votes
0answers
30 views

Multi-User QGIS Editing? [on hold]

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 ...
0
votes
0answers
13 views

How to get the “modified” date for a FeatureClass in a file geodatabase via ArcPy?

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 ...
1
vote
0answers
12 views

QGIS 3.4 Modeler: Select a band of a raster layer for processing

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' ...
0
votes
0answers
11 views

Problem in installing ArcGIS for Server 10.3 and msxml3.dll

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 ...
0
votes
0answers
24 views

QGIS-Distance Matrix. Is it possible to do in python?

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 ...
1
vote
0answers
14 views

Dealing with prediction map of Simple kriging interpolation? [on hold]

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?
0
votes
0answers
7 views

Using Raster Calculater to create .asc files in QGIS?

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 ...
1
vote
0answers
10 views

How to use the Raster Calculator in PyQGIS (Console) in QGIS 3?

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 ...
1
vote
0answers
11 views

PostGIS - Get geofence polygon points within 100 metres of an existing geofence

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 ...
0
votes
0answers
7 views

How to filter a csvLayer based on attributes?

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", ...
1
vote
0answers
10 views

How to mask raster image (DEM) on QGIS Grass

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 ...
0
votes
0answers
13 views

ALOS PALSAR resampling

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 ...
1
vote
0answers
28 views

What are the arguments for QgsDistanceArea().setSourceCrs()

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()....
1
vote
0answers
14 views

Issue displaying UTM coordinates in QGIS 3.6.1

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 ...
0
votes
0answers
10 views

The layers of KML and KMZ do not paint

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 "...
1
vote
0answers
8 views

Adding vertices at a centerline node not working in QGIS3

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 ...
1
vote
0answers
23 views

Turning one column to multiple columns in Attribute Table?

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 ...
0
votes
0answers
11 views

Take all the polygons of a shapefile in a list in Google Earth Engine [on hold]

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 ...
0
votes
0answers
13 views

How to see classifications of ArcGIS Pro Iso Cluster Unsupervised Classification output raster?

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 ...
0
votes
0answers
10 views

Getting changed data in csv to show up in Google Earth Pro

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 ...
1
vote
0answers
15 views

QGIS - How to add joined values table data to shapefile

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 ...
2
votes
1answer
23 views

Non-interactive points in Leaflet

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 ...
0
votes
0answers
19 views

Values change after re-projecting the NetCDF files to TIFF file

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 ...
0
votes
0answers
9 views

How to get geocode of points using Velodyne VLP Lidars?

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 ...
0
votes
1answer
33 views

Adding `properties` to GeoJSON polygon created using GeoPandas with Python? [on hold]

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 ...
-2
votes
0answers
19 views

How to download data from a website that has been shutdown? [on hold]

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 ...
1
vote
2answers
35 views

Update 1 random value in a group of values

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 ...
2
votes
0answers
30 views

Top conferences and journals in GIS [on hold]

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

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