All Questions

0
votes
0answers
11 views

How to download shapefile

This is probably a trivial question but I'm new to the field and would need to ask for your help. I'm trying to download the shapefile (orange line) from https://www.openstreetmap.org/relation/271888#...
0
votes
0answers
2 views

Using XSLT conversions in GeoNetwork to add XML nodes to metadata record during import

I want to use "Apply XSLT converison" option in GeoNetwork when importing new records to add new XML snippet to my metadata record. I need to add aditional XML content (gmd:identifier) to the ...
3
votes
1answer
27 views

Order of parameters in QGIS 3.6 graphical modeller

When using graphical modeler in QGIS 3.6 I have added additional parameters to the model inputs for the buffer tool. The model looks like this: When running the tool the order of the parameters in ...
1
vote
1answer
36 views

Changing name of file download from browser app?

I am developing browser application using MapServer and JavaScript. I've got part where on map click I get FeatureInfo about an object: function getFeatureInfoGML(map){ var openwindowhandle=...
0
votes
0answers
5 views

When using QGIS Model Builder with geopackages is there any way to Extract one Specific layer when using clip function?

I would like to use QGIS model builder to allow extraction of certain layers of a geopackage. I am trying to clip a geopackage containing multiple layers using model builder and when run it the ...
57
votes
1answer
333k views

Calculating longitude length in miles?

Suppose I have geographic coordinates of "Saratoga, California, USA" as Latitude: 37°15.8298′ N Longitude: 122° 1.3806′ W I know from here that in case of latitude 1° ≈ 69 miles and that ...
0
votes
0answers
5 views

QGIS 3.4, Why doesn't MapBox look the same ion Map canvas as in Layout?

When I export, the basemap looks completely different. And then Exported as .jpeg: Have asked MapBox and they don't know.
0
votes
0answers
12 views

Update Shape file with values from Excel Cell in Qgis

I have an excel table with unique Id values. 1 2 3 4 what I want to achieve is when editing a point shapefile with the same Id field every time a new point is created the Id field is filled by the ...
0
votes
0answers
19 views

ArcGIS Pro: Select by location result varies w.r.t system being used [on hold]

We are getting different results if we run the "Select by location" tool in ArcGIS Pro (same version 2.1.1) for same two layers but in different machines. We didn't assign any tolerance level and the ...
1
vote
1answer
1k views

Exporting entire bbox from overpass turbo?

I'm trying to export all the elements (peak, tracks, routes, streets.....) of a bounding box I have selected. I'm trying to do this with the wizard, but within it, I have to choose specific tags and ...
0
votes
2answers
39 views

Getting MapBox basemaps into QGIS?

Have been playing around with this answer for a while and I can't get it to work in QGIS 3.4.4: https://docs.mapbox.com/help/tutorials/mapbox-arcgis-qgis/#add-mapbox-maps-in-arcmap No help on ...
0
votes
0answers
6 views

WebAppBuilder requiring authentication

I'm trying to install QGIS plugin WebAppBuilder from the Boundless repository, following the instructions available at http://boundlessgeo.github.io/qgis-plugins-documentation/suite/install.html and ...
1
vote
0answers
13 views

Flow data distribution within features of overlapping layers

I want to improve/adjust/comprehend the formula (see below) that was used in my previous question: Transferring flows (connections + values) between polygons for calculating flow values of mobile data ...
1
vote
0answers
10 views

AttributeError: module 'processing' has no attribute 'runandload'

I am trying to load a layer after its creation, by using runadload(), but I am getting the error: AttributeError: module 'processing' has no attribute 'runandload'. Here's the partial script: ...
0
votes
0answers
6 views

Add custom icon via mapbox.attr

I try to add my custom icon via mapIcon attr but doesn't work: <script type="text/javascript"> function fc_addressint_initMap(mapBox) { var mapLatLon = eval("(" + mapBox.attr("...
0
votes
0answers
4 views

ArcMap 10.4.1, How to show linked pictures in layout data frame for a map book (using Basic License)

I'm trying to create a map book for a tree inventory in ArcMap 10.4.1. I have a shapefile (no problem changing to a gdb) with 350 points, and the goal is to get a layout consisting of 3 data frames: ...
1
vote
1answer
31 views

Find shortest distance from a point or points to a number of polygons at varying angles

My aim is to calculate the distance a point is from land in Python, trying to replicate the functionality of fetchR. Given an origin and distance, I create shapely LineStrings which radiate out from ...
3
votes
2answers
39 views

Look up OS grid letters from easting/northing in R

Suppose I have an easting/northing point: data<-c("423851", "300384") I would like to find out the grid letters for this point using the British National Grid system (Ordnance Survey). If you ...
1
vote
1answer
43 views

Mimic in-line GeoJSON using fetch()

For simplicty, referencing this example: https://carto.com/developers/carto-vl/examples/#example-load-external-geojson-layer I would like to have this bit of code behave the same as through it were ...
1
vote
0answers
28 views

Calculate % Change from single table

I have a single table of data (crimes committed) and a region that I want to compare. I use the Percent Change function of the Crime Analysis Ribbon, I have to feed it two tables and a polygon. ...
1
vote
1answer
21 views

How to crop raster in R without losing the colors?

I have a 2x3 raster in R, with values 1 to 6. library(raster) r <- raster(nrows=3,ncols=2,xmn=0,xmx=2,ymn=0,ymx=3,vals=1:6) colors <- c('red','orange','yellow','green','blue','purple') plot(r,...
3
votes
2answers
578 views

How to UPDATE with LATERAL Nearest-Neighbour query?

Say I have table gps like: CREATE TABLE gps( gps_id serial primary key, measured_timestamp timestamp, geom Geometry(Point,4326), stop_id int --Null ); And I have a table of stops like: ...
1
vote
1answer
24 views

Removing North arrow?

I use QGIS and don't know why there is a North indicator (see the figure). Anyone know how did it come and how to remove it?
1
vote
0answers
10 views

{{bbox}} value in Overpass Turbo

I am using Overpass Turbo, quite a nice tool, but I want to extract the bbox values and use them in a osm-python-tools query. Oddly I don't see anyway to get the values of my current bbox, I don't see ...
1
vote
1answer
31 views

Join a CSV file to GeoJSON using ogr2ogr in a Python script?

I have a CSV which I would like to join to a GeoJSON. I found this answer which I tried to implement but I can't get it to work just yet. Here's an extract of my python: join_command = ['ogr2ogr', '...
2
votes
2answers
10 views

MBtiles from OpenMapTiles doesn't work with Geoserver MBtiles extension

I am using MBtiles files from OpenMapTiles (free ones for personal and non commercial project) in Geoserver (I have installed the MBTiles extension) the store creation work perfectly but I got an ...
1
vote
1answer
50 views

PyQGIS script returning blank layer when applying singleband pseudocolor

So I'm trying to automate applying singleband pseudocolor style using a python script on a height map (.tif file). Here's the code : rlayer = QgsRasterLayer(inp, "pseudocolor_layer") fcn = ...
1
vote
0answers
10 views

ArcGIS Collector with ArcGIS Portal webmap failing on attachments

I have a web map that has been created on ArcGIS Portal. Our Portal is federated. The feature layer (service) and web map have all the required settings based on the documentation of ArcGIS Collector ...
0
votes
0answers
11 views

How to write MNDWI for Sentinel 2 Images in Google Earth Engine?

MNDWI is the normalized difference of Green Band and SWIR Band. In LANDSAT both are of a similar resolution i.e. 30m. In the case of LANDSAT var landsat8 = ee.Image("LANDSAT/LC08/C01/T1_RT_TOA/...
0
votes
0answers
8 views

MySQL Query for Getting Records within Radius

Coordinates in the table are stored in 3 separate columns x, y and zone and are formatted in UTM. Here is the idea: I get the current position of the user (in lat long but I can convert it to UTM if ...
2
votes
0answers
11 views

Getting results from processing.run GRASS r.resample in PyQGIS

I am trying to get output from r.resample in a stand-alone PYQGIS application. The command runs and does not show any errors, but it does not save an output file (i.e. 'c:/path/to/output.tif') . I can ...
1
vote
1answer
37 views

GDAL C# Bindings for VRT don't write a VRT file

I have previously asked this question on stack overflow, and am now asking this more specialized audience. I'm wondering why the GDAL C# library (v2.3.3) call to Gdal.wrapper_GDALBuildVRT_names(...) ...
6
votes
0answers
99 views
+100

QGIS can't load geometryless WFS tables published with QGIS Server

I created a QGIS 3.6 project on Windows Server 2016 x64 with two PostGIS layers: Layer A: Points Layer B: Datatable (No geometries) and configured QGIS Server options on the project like this: Now ...
0
votes
0answers
10 views

Impossible to export a 3D city models as KML tiles

I want to display 3D city models, stored in a CityGML file, in a Cesium Virtual Globe. I used the software "3D City Database Importer/Exporter" to store this data in a PostGreSQL/PostGIS database. ...
0
votes
0answers
6 views

Output coordinate system for PCL segmentation

I run cylinder segmentation in Point Cloud Library for my point cloud to extract cylinders using following code http://pointclouds.org/documentation/tutorials/cluster_extraction.php#cluster-extraction....
2
votes
0answers
15 views

Creating polygons from binary image using QGIS

Here I got a binary image of buildings and I need to convert them to building polygons: The expected outcome will be a vector file with building polygons based on the image like this: blue as polygon ...
0
votes
0answers
256 views

Getting started generating vector tiles [on hold]

I am working on an app that displays a nice map. Currently, we use raster tiles, but we'd like to switch to vector tiles. We want the freedom to add all the information we want, so we want to create ...
0
votes
0answers
5 views

Show Map Full extent on Home Button

I am figuring out how to change the default extent to full extent and the default extent text display when move over the button. <!DOCTYPE HTML> <html> <head> <...
2
votes
1answer
25 views

QGIS 3.4.5 tracing tool misses vertices

I'm using QGIS 3.4.5. I'm trying to make a new polygon layer that traces the border of a polygon on another layer. The tracing tool works fine except for the last vertices. I´ll attach an image to ...
0
votes
0answers
12 views

3D-analyst: Interpolate line problem

Nothing happens when I double click to finish the line. I have on the 3D analyst extension and have chosen the right DEM. What is wrong and how do I fix it?
1
vote
2answers
37 views

Finding points within various radius's of another point

I am trying to find the number of crash accidents locations that lies within the radius's 0m-100m, 100m-200m, and 300m-400m of each red light camera location. However, I am not sure how I can do this. ...
-2
votes
0answers
14 views

ArcGIS Pro Speed? [on hold]

The first 5 days when I Used ARCGIS Pro it was so fast, but today it is so slow. Note:I didn't load it with anything nor load my computer. How to re fast it?
1
vote
5answers
16k views

Creating symbol with size and color based on two variables in ArcMap?

In ArcMap 10.2, I have a layer that has two attributes: depth and magnitude. Depth should be represented by color: deeper points being lighter and shallower being darker. Magnitude represented by ...
8
votes
6answers
8k views

Fiona ImportError: DLL load failed

I've been using the great Shapely/Fiona combo successfully on Linux, but now i need to create a kind of production environment on windows and theres only one problem. When i try to import fiona, i get ...
0
votes
0answers
8 views

Pixel inconsistency in ENVI classification result

I'm new to remote sensing I classified Landsat 8 imagery with two methods of classification (ANN and MTMF) in ENVI, but they produced different number of pixels when I calculate the accuracy using ...
0
votes
3answers
136 views

QField sync.FileNotFoundError: [Errno 2]

I am using QGIS 3.4.5 (Madeira) alongside with QField 1.0.3 (Matterhorn) with the QField Sync 3.1.3. Everthing worked fine. I made my Project, made it to a QField-Project (with QFiledSync), then to ...
0
votes
0answers
17 views

How to pass the value of a string instead of string itself [on hold]

I have a function private static String change(String iden) { if (iden.equals("abc")) { return "abc";} else { return "def"; } Then in another ...
0
votes
0answers
7 views

Converting the vertical datum of elevation data in R

I have elevation data for 699 points around Australia. I want to calculate the difference between these point elevations and the highest elevation within 25 nautical miles - in simple terms I want to ...
1
vote
0answers
21 views

Scattered pixels to line (hedgerows segmentation in satellite images)

I want to segment hedgerows in a satellite image. I'm using QGIS with SCP plugin (based on pixel color signature) to have a decent segmentation of the hedgerows. But I have two remaining problems: ...
1
vote
0answers
12 views

FME Many to One to append attribute and not create new feature

I have a land cadastre table where the property number is repeated whenever there is more than one owner and the unique field is the Land_No. Wherever the prop number is repeated, I want the ...

15 30 50 per page