All Questions

1
vote
1answer
19 views

Attribute table After Union

I did a union of 2 layers, which technically represent the same thing but one is the updated version. This means that there is a common field in both, lets call it A. After I did the union, I opened ...
-2
votes
0answers
28 views

Scaling heatmap in QGIS? [on hold]

I am producing a heatmap of England cities regarding number of vehicles, i want to show cities with high and low number of vehicles using heatmap, over 5 years. How do I do that using heatmaps in ...
0
votes
2answers
84 views

Export longitude and latitude

I need the exact values of longitude and latitude to do further calculations with those. Best case would be to have a list with all those dates and do the calculation with this. I exported from ...
-1
votes
0answers
42 views

GPS accuracy today and in the future [on hold]

when can we expect to have a stronger GPS accuracy? In general I understand that the current Galileo satellite system, or GNSS, is ready but is not being used by devices. What I am not understanding ...
0
votes
1answer
37 views

Multiplying points to another feature table using ArcPy?

I have a point feature class like this: And another table looks like this: How can I add point's xy coordinate to that table based on their No. and automatic multiply as their No. multiplies using ...
0
votes
0answers
15 views

Sentinel2 | Searching for tail by polygon

I use Python with the following directories: sentinelsat SentinelAPI read_geojson geojson_to_wkt I have a GeoJSON file that contains the coordinates of the location I'm looking for. I try to get ...
1
vote
2answers
57 views

QGIS: keep the outline of a building

Is there a way to keep the outline of a building? I am using a shp with lines showing the walls of a building (originally CAD file). I would like to keep only the outline of the building either as a ...
0
votes
0answers
24 views

Export OGR feature style data from QGIS for use in GeoPDF

I have a fully formated map in QGIS from which I wish to make a GeoPDF. I followed this and this tutorial and generated a simple version of my map without much problems. I am however looking for an ...
2
votes
0answers
28 views

Add pixels to a raster image

I have a georeferenced raster with water depth values and I would like to add more pixels in order to extend my raster as far as the coastline (like in the picture, dark blue has no values). How can I ...
0
votes
0answers
24 views

Creating drive time buffers in QGIS [duplicate]

I have a set of points in QGIS and I am trying to create drive time buffers around them, how do you do that? I am using QGIS 3.6.3.
1
vote
0answers
18 views

Converting shapefile to .osm.pbf

I am trying to convert a GIS LINE shapefile into a .osm.pbf file on Windows. I've done some research on the topic and some tools that kept coming out are: Merkaator shp2osm - which deals mostly with ...
0
votes
0answers
13 views

Processing commands not producing shapefiles in Python 3.7

I am using a standalone python 3.7. QGIS script to reproduce a commands that work when using the QGIS interface. The code works in the standalone script (i.e. produces no errors or warnings), however ...
0
votes
0answers
23 views

Python error on QGIS

We are doing the slope analysis for one of our clients and can find the following error every time we do the analysis. We have not faced this situation in the past. The QGIS version which are using is ...
0
votes
0answers
21 views

Saving changed positions in SQL Server table X, Y columns

I have a SQL Server table with X,Y columns linked to QGIS 3.6, and I made a virtual layer of it using "MakePoint(X,Y,CRS_id) as geometry". Now I want to shift a point in the map and have the change ...
-3
votes
0answers
51 views

GIS, drone image processing [on hold]

I wish to extract features (vegetation, roads, buildings, etc.) from a TIFF image generated using Pix4d. Can this be done in QGIS?
0
votes
0answers
24 views

Fail to import gdal from conda environment?

I installed gdal from this link: http://www.gisinternals.com/query.html?content=filelist&file=release-1911-x64-gdal-3-0-0-mapserver-7-4-0.zip When I use the the following command from this ...
0
votes
0answers
16 views

Mapbox gl offline

I'm trying to prepare mapboxgl app which works offline, I want to use only javascript engine, local rasters and geojsons. How to avoid connection to mapbox tiles? <script> mapboxgl.accessToken =...
0
votes
0answers
12 views

How to use Nominatim API to show an iframe with a map from openstreetmap? [on hold]

I want to exploit API requests to add maps to my webpage dynamically, according to which name of a city the user types into the search field. I want to do that by using Javascript/JQUERY and JSON ...
0
votes
0answers
13 views

Dynamic create layers as String [on hold]

Dynamic create layers as String: But I have problems. It take as string which is not allow in layers for (let l of Alllayers) { var tmp = tmp + "{ name: '"+l.name+"',"+ "description: '"+l....
0
votes
0answers
21 views

Using BarnesSurface Style in GeoServer?

I want to apply the BarnesSurface style to a layer in the GeoServer. I applied the SLD samples I found in my research, but did not get results. I get the sample “Image-1” from the GeoServer demo page. ...
1
vote
1answer
17 views

How to build polygons from buffered points and merge overlapping ones using R?

I have a sample of 3 groups of points which are similarly spread within their groups. > pts x y [1,] 453067.5 364073.5 [2,] 453066.5 364072.5 [3,] 453068.5 364072.5 [4,] ...
1
vote
0answers
21 views

Automatic zoom when uploading shapefile R

I would like to set a zoom on the shapefile's canvas when it is uploaded. is there a function for that? Here is my script that allows adding the shapefile after reading with OGR : observeEvent(input$...
0
votes
0answers
14 views

Convert KAP files

I've got some .KAP files which are missing spatial data and as such, I cannot convert them into something more useful like a .TIF image. I've been using FME which errors on these files with "Failed to ...
1
vote
2answers
118 views

Using Python Parser in ArcGIS Pro Field Calculator?

I am having a problem in migrating from Vbscript to Python for ArcGIS Pro. Building 5, Street 6 What is wrong in this expression? "{}:{}:{}:{}:{}:{}".format("Building ",!Building_Number!," , ",!...
0
votes
1answer
18 views

Change rendering order of objects in MapInfo table?

i have one big MapInfo file where i did a lot of digitizing work. Now i have the problem of disapearing points under polygons (or polygons under polygons, lines under polygons etc.). How can i ...
1
vote
0answers
22 views

Load a shapefile using PyQGIS (QGIS 3.4) on ubuntu?

I want to create a standalone application based on QGIS API. Here is my source code to load a shapefile: import sys from qgis.gui import * from qgis.core import * from qgis.core import QgsProject ...
0
votes
0answers
12 views

Failed to complete the task about the ServiceAreaTask

When I am trying to do the task about the ServiceAreaTask, the callback can not be executed. This is my code: <html> <head> <meta charset="utf-8" /> <meta ...
1
vote
0answers
26 views

How to get back the Processing Toolbox? Re-installation also doesn't work! QGIS crashes when I try to activate it using Plugins Manager

Processing Toolbox missing after I copied a python script from the Scripts folder to my local folder, and QGIS crashes when I try to active the "Processing" under the Plugin Manager
1
vote
1answer
20 views

How to avoid start/end points of line modification with ol.interaction.Modify

To modify line geometry on OpenLayers(3-5), we use ol.interaction.Modify. What I want to do is, enable modify any points on line, except start / end points. But just using ol.interaction.Modify ...
2
votes
0answers
20 views

.ecw file not imported in its projection in QGIS

I have a .ecw aerial image and one of the associated files is .prj, which i assume defines the Coordinate Reference System of the image. The .prj is as follows: PROJCS["PNG94_PNGMG94_zone_55",GEOGCS["...
1
vote
0answers
25 views

QGIS Vector Tiles Reader does not apply style

I have downloaded Vector Map Tiles from Open Map Tiles and have these tiles as local .mbtiles file. In QGIS there is the plugin called Vector Tiles Reader and I have the following problems: I ...
0
votes
0answers
8 views

ServiceAreaTask with JavaScript

When i am trying the ServiceAreaTask with javascript4.11,there is a bug that the callback cannot be executed. This is my code:serviceAreaTask.solve(params).then(showServiceAreas);
0
votes
1answer
10 views

Plot GeoTIFF using tm_rgb from R tmap package

I've exported a raster object from QGIS into GeoTIFF format and imported it into R as a raster brick using the brick() function from the raster package. The file is too large to share but it imports ...
-2
votes
0answers
15 views

Merging Postal areas to statistical area unit? [on hold]

I am interested in converting postal area level classification into statistical area since my datasets are at postal level and I want to do modeling on SA level. How can that be done?
0
votes
0answers
6 views

How to set an image size when d.mon?

I'm trying to export a vector as a PNG: r.contour in=FORMOSA out=FORMOSA_CNT step=100 cut=200 --overwrite d.mon start=png output=FORMOSA_CNT.png --overwrite d.vect FORMOSA_CNT color=red d.mon stop=...
1
vote
0answers
27 views

QGIS: habitat suitability/combining raster layers

I have created a number of raster layers for different environmental factors (slope, roads, rivers, forest cover) and want to combine them to find areas where the 'ideal' aspects all overlap. For ...
1
vote
0answers
23 views

Obtaining geographic data for California?

Where can I download census tracts and infrastructure data of California for 1997?
0
votes
0answers
17 views

QGIS+PostGIS set atlas extents to include atlas feature and point

I have a QGIS print layout with an atlas layer for which I would like the map extents to show the current atlas feature and a nearby point. The layer provider is postgis. It seems the only way to do ...
1
vote
0answers
9 views

QGIS 3.6 splitwithlines algorithm does not always split

I'm trying to split one line layer with another line layer, and additionally get the vertices where they intersect. However, if a line is self-intersecting, it does not split the underlying layer. In ...
1
vote
2answers
31 views

Cannot read pixel value from DTM raster with QGIS

I am using this DTM: http://ags.cuzk.cz/arcgis2/services/dmr4g/ImageServer/WMSServer?request=GetCapabilities&service=WMS At ArcGIS I am able to ready pixel value of the raster but at QGIS it ...
1
vote
1answer
24 views

Substracting raster values from 2 rasters with different cell sizes

I am working with two raster files. The first is a DEM and the second an elevation-correction file. Both files display the same geographic region. My problem is that the cell sizes of both files aren'...
1
vote
0answers
11 views

Georeferencer stopped working

I georeferenced some things about a month ago no problem. However now when I click my reference plugin it does not open the Georeferencer dialogue box or the georeference drop down menu. It is enabled ...
0
votes
0answers
33 views

Can't open shapefile with GeoPandas

I downloaded a shapefile from the Brazilian Institute of Geography and Statistics (IBGE). I can open it on QGIS and work with it perfectly there, but I need to work with it using Python. I'm trying ...
1
vote
1answer
29 views

How do you find which points connect to other points

I have points that I have created from vector lines. To be more specific these points are end and start points of vector lines. But what I want to do now is identify which points connect to each other ...
2
votes
1answer
23 views

Count points belonging to a country but outside of country polygon (coastal)

I'm still getting my head around GIS and am using QGIS 3.6.2. I'd like to do a simple count of points within countries. The problem is that many of my points are located on coastlines or islands, so ...
0
votes
2answers
26 views

Search control on Leaflet

I would like to have search control for Leaflet, with suggestions to street addresses, like on this image from Google Maps: Some of the plugins I tried (https://labs.easyblog.it/maps/leaflet-search/) ...
0
votes
1answer
29 views

Project an unknown coordinate system on a map

I am currently working with a data set, which uses an unknown coordinate system from the south island of New Zealand, using x and y coordinates. I have these in an Excel sheet, but no further ...
1
vote
1answer
15 views

ArcGIS: Extract portion of a geometric network that exists 30 mi downstream of intersection with another layer

I have flow lines for streams. I've made them into a geometric network. The streams intersect with a rail network. I want to find all of the points of intersection and then get all of the flow lines ...
1
vote
0answers
19 views

Loading temporary layer in processing PyQgis 3.4

I have been working on processing script in PyQgis 3.4 and i have serious issues with loading temporary layers to project after processing. Since following code works perfectly fine: entimport ...
0
votes
2answers
36 views

ArcGIS REST layer doesn't show up in OpenLayers

I try to show a WMS layer with OpenLayers 4.6.5 but the tiles don't show up. I use the following code to load the WMS layer as ArcGIS REST service: new ol.layer.Tile({ source: new ol.source....

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