All Questions

1
vote
1answer
28 views

QGIS transparent layers plot as solid opaque - solution? [on hold]

I have been trying to plot from QGIS to a HP Designjet T120 plotter using Win10x64, but the transparent layers of my QGIS project appear as solid opaque on the plot. If I plot to PDF to transparent ...
0
votes
1answer
58 views

Counting number of polygons within polygons using R?

I have two huge shapefiles. One contains polygons of one kind of vegetation and the other one representing a grid. A situation as follows but, of course, much bigger: I need: the efficient way to ...
1
vote
1answer
39 views

How to write Python if/then statement using information from two fields in field calculator

I am using ArcGIS Desktop 10.6.1. I create a new field of type short integer in the Attribute Table. My new field is named CIPOT and I want to populate it with values from the field CI, but only if ...
1
vote
0answers
21 views

Unable to load output layer from Python algorithm in QGIS 3

I'm building a Python algorithm for QGIS 3, to be run from the Processing Toolbox. I've finished debugging the algorithm body, which seems to work, but QGIS is unable to load its output. Here's the ...
1
vote
0answers
41 views

PostGIS st_intersects with exceptions

I have a query in PostGIS using st_intersects like this SELECT "name", "id_punto", "geometry", "properties", "type" FROM "points" AS "points" WHERE st_intersects("geometry", 'POLYGON ((-103....
0
votes
1answer
26 views

How to access a table row in CARTO.js histogram dataview

How do I access a certain row in a CARTO source? For instance, I have Chart.js reading the ticketcount column using this: var source = new carto.source.SQL('select * from ticketspercounty_copy'); ...
2
votes
1answer
37 views

Select by attribute does not work on an indexed field

I came across an issue where I can no longer run a select by attribute on a field (In my example it is "Students_7") in a shapefile that previously worked. Even when I build the query using the wizard ...
1
vote
0answers
25 views

Preventing Excel auto-formatting fractions when exporting from MMQGIS

I export cable sizes from QGIS via MMQGIS to an excel csv. I have issues with Excel changing values such as "4/0" and "1/0" to dates when I open the exported table. Anyone know of a way to prevent ...
1
vote
1answer
59 views

Map automation using open source Python modules

I have a shapefile with 3000 parcels. I am going to generate a map for each parcel. The map should be the same as the following paper map. I know that arcpy.mapping can be used for this purpose. I was ...
0
votes
0answers
11 views

LSIB feature does not align with island boundary

It looks like there is an alignment issue that arises in EarthEngine with the LSIB polygons. It exists for Greenland in both the Detailed LSIB 2013 and Simple LSIB 2017 datasets, and can be verified ...
1
vote
0answers
29 views

Using .map() to display multiple images in an ImageCollection [duplicate]

How do I display multiple images from an image collection using .map()? // Create clipping function var clipper = function(image){ return image.clip(geometry); }; // Load image collection var ...
2
votes
0answers
40 views

How to resize a raster to the same extents of an equivalent raster?

So here's the problem I have a georeferenced orthomosaic which I used to generate land cover data. During the pixel classification phase of land cover study, I had to use other softwares to help me ...
1
vote
0answers
35 views

How can I get GeoJSON from Esri software to load in leaflet?

So I am trying to take a GeoJSON file that I have generated from an Esri shapefile in ArcGIS Pro, but it is not rendering on the map for some reason... The GeoJSON that was created from ArcGIS Pro is ...
1
vote
0answers
17 views

Shapefiles misalign with Google Maps when exporting from Print Composer [duplicate]

I've built a project with several shapefiles and Google Satellite as a background. Everything seems to be perfectly fine, I manage to prepare the Print Layout but when I finally save as image or PDF, ...
2
votes
1answer
44 views

Getting the percentage area of intersecting polygons [on hold]

I have the polygons for census tracts within New York City. I also have the polygons for the parks. What I would like is % of the census tract area, with an added 400 meter buffer, that is park. I'm ...
0
votes
0answers
16 views

Axis orientation switching in ArcGIS [on hold]

My local projection coordinates increase in south and west directions. In QGIS I use +axis=wsu (proj4) and both vector and raster layers can be asigned to this local projection. Can I switch axis ...
1
vote
1answer
39 views

PyQGIS - Plugin returns error from processAlgorithm. Invalid Result

I've written a script which automatically creates a print layout and exports it. Now I'm trying to integrate the code into my plugin's code. The plugin has some existing functionality and I'm adding ...
1
vote
1answer
18 views

Layers Properties - Extent - Custom Extent [on hold]

If I were to set up a custom extent on several global data layers using a smaller geographic region (i.e. North America), will Arc still "draw/process" that data even though it is hidden outside my ...
0
votes
0answers
10 views

How to remove artifacts with SQL Server GEOMETRTY::UnionAggregate()

We'd like to do an effective "real-time dissolve" on an Esri feature class with a SQL GEOMETRY shape where a parcel layer is "dissolved" into products using an attribute (ProductID) of the parcel ...
0
votes
0answers
18 views

WFS Transaction Post Method 403 OpenLayers 3 + GeoServer

I am having difficulty understanding the topic when it comes to XML generated from GeoServer and how can we interact with it. I want to to implement WFS transaction service and updating my attributes ...
0
votes
0answers
14 views

Whitebox GAT branch depression big raster

I'm trying to run the tool Brunch depression form Whitebox GAT but the process doesn't work probably because the DEM is oversize For generate that raster i converted the single quadrant in the ...
-1
votes
0answers
19 views

Count number of utilities crossing a road [on hold]

I have a map of different utilities(water network, electricity network and sewer network) crossing different roads in a city, how can automatically detect how many utilities cross a road intersection ...
0
votes
0answers
17 views

Geoserver problem rectangular images can not be selected at edges

I have a Geoserver layer that displays some points. Each point has an image_url attribute. My styling doc is so simple: * { mark-size: 100; mark: url("${image_url}"); } The problem, as shown ...
0
votes
1answer
32 views

Calculate new Lat/Lon from initial Lat/Lon plus Cartesian X,Y [duplicate]

For small distances (below 10 km), assuming Earth is flat and I have initial Lat0/Lon0 and I have X(km), Y(km) distance From Lat0/Lon0, how can I calculate new Lat/Lon for the added X,Y?
-1
votes
1answer
24 views

Is there a place where I could find Geometries of MTM Zones in Canada?

Trying to determine automatically which zones my Lat long data is in using geometries of MTM (Modified Transverse Mercator) Zones. Is there any shapefile (or other format) of the different MTM zones ...
0
votes
0answers
19 views

Adding z value to geometry of GeoJSON file [on hold]

I need to add elevation values into geometry of linestring GeoJSON file. Here is a sample code of the GeoJSON: "geometry": { "type": "LineString", "coordinates": [ [ 13.8444757, 47.7506804 ] What I ...
0
votes
1answer
24 views

Retrieve selected feature on ArcGIS Online as string?

For now I am trying to create a webmap with the ArcGIS API (4.x) for JavaScript. I have a bit understanding of the workings of JavaScript, however I couldn't find code in which it's possible to select ...
0
votes
1answer
29 views

Installing packages into OSGeo4W64-QGIS-Python and not in Standard Python installation on Windows?

On my Windows 10 PC there are (at least) 2 Python 3.7 versions installed: a) "Standard Python 3.7 64 bit with IDLE, which I downloaded from the site python.org and installed. b) The Python 3.7 which ...
1
vote
1answer
78 views

Handling AIS data using Python and PostGIS?

I want to turn points into a linestring in PostgreSQL with the extension of PostGIS using Python. I want the lines in a new table because every few minutes more points are added and it needs to keep ...
2
votes
0answers
27 views

Add basemap copyright in QGIS?

I am using the QuickMapServices plugin for basemap imagery and was wondering if I can add a QGIS legend that includes default copyright information? I know this can be done in ArcMap...!
0
votes
1answer
27 views

Clipping classified image by shapefile in Google Earth Engine

I have classified an image tile, but I cannot clip it along the area shape. How do I do it and get my study area classified and clipped in a TIFF file?
0
votes
0answers
6 views

PDAL Filter output is same as input file

I've applied SOR filter using PDAL python.Below is the code snippet of the same, json = """ { "pipeline":[ "D:/Lidar_collect_3/output/output_1.las", { "type":"filters....
1
vote
1answer
26 views

Create geometry column in Geopackage with SQL

How to create a table with geometry column that is recognized as spatial layer? I use the DB manager from QGIS 3.4.2 I use the following: CREATE TABLE 'sample_attribute_with_geometry' ( id INTEGER ...
0
votes
0answers
10 views

ogr2ogr multiple S-57 files to one layer

I am a QGIS user in Ubuntu. I have 320 S-57 files (.000) that contain a layer called DEPARE. I want to load all the DEPARE layers from the 320 files and merge them into 1 layer so i can load that one ...
0
votes
1answer
33 views

Create atlas series with yearly maps from 1920 to 2018

I have a lot of maps I need to create. One for each year that shows what have happened in the map area. First map are supposed to shot 1920. Then the next one are supposed to shot 1920+1921. And the ...
-2
votes
2answers
56 views

How to gently ask PostgreSQL to add PostGIS extension

I have recently installed PostGIS for the first time. I'm trying to use psycopg2 to create some polygon features. This runs: cur.execute('CREATE TABLE test_insert_shape (uuid varchar PRIMARY KEY, ...
-1
votes
0answers
35 views

Count number of polygons and area in shapefile and convert into raster using R [on hold]

I have a shapefile containing polygons of many buildings. I would like to count how many buildings are there and what is the total area of the buildings per 1km^2, and save/convert these data into a ...
1
vote
0answers
16 views

Identifying area code for a particular US city

I'm trying to build a query like: "tell me what area codes (telephony area codes) overlap San Francisco" which should return 415 and 628. Doing some google searches indicates that the US census data ...
1
vote
0answers
32 views

Export marker line to DXF [duplicate]

I was wondering if there is a way to export in DXF from QGIS (version 3.4.4) this type of line (The one with the "E" as a pattern). Here is how the line was created Currently, when I export this ...
1
vote
0answers
20 views

How to compare centrality of points in different shaped and sized polygons

Suppose I have several polygons of varying shape and size, each containing a single point. I want to compare the centrality of each point, and determine which point is more central to its polygon. I'm ...
1
vote
0answers
40 views

Quick way to add point features on a map

I am looking for a quicker way to add points. I am mapping the buildings on a satellite imagery, but every time I add a point, I need to press enter to close the action menu. Is there a way to add ...
1
vote
0answers
31 views

No icons when installing QGIS 3.4.4

I've been trying to install QGIS 3.4.4 Madeira on Windows 10 x64. I've tried the network installer and the standalone version, both of which say they installed successfully but no desktop or start ...
0
votes
0answers
21 views

Statistics on the area of various categories according to administrative divisions

When I need to count the land use of small areas, such as the analysis of a province's land use classification map, the use of zoning statistics (zonal statistic as table) can be directly obtained ...
1
vote
1answer
45 views

Highest point from DEM

I generated the next DEM abd Orthomosaic and I am interested in extract the highest point of each building, is there any workwflow that I could implement in QGIS or SAGAGIS
-2
votes
0answers
15 views

Pixel-Level NDVI : what is it

I have basic knowledge on how to compute floating or integer based NDVI value of an AOI on daily, weekly, monthly or yearly scenes BUT do not understand what is meant by pixel-level NDVI value. ...
0
votes
0answers
30 views

Decrease the volume of vector tiles generated by GeoServer

I've used GeoServer vector tile extension to produce PBF files from set of shape files. The problem is the generated MVTs from GeoServer have larger volume in comparison with Mapbox ones. How can I ...
0
votes
0answers
8 views

Creation of multiple Referenced Mosaic Datasets with different names and coordinate systems

I am trying to create multiple Referenced Mosaic Datasets with different names and coordinate systems based on 1 source mosaic dataset. My code is as follows: # test referenced mosaic dataset ...
2
votes
1answer
15 views

Connect sub model to cell statistics

I'm working on a bunch of raster imagery using ArcGIS 10.6. I have a several sub models consisting of iterations of raster files. Here's one of them, the other do the same but with different ...
0
votes
1answer
27 views

Access Label from DockableWindow and Update text to it ArcObjects C# [on hold]

I am adding dock-able window and opening it on click of a button, I have a Text on it and I want to Update feature count in that Text box. When I draw a polygon on ArcMap I am able to get Feature ...
0
votes
2answers
31 views

How to pass tile size of to 512 using OpenLayer 3 and GeoServer 2.14

I am trying to change the default tile size of 256 to 512 using OpenLayers 3. Code is working fine for normal WMS request, but giving error (tiles not loading) for WMS-C request. My sample code is: ...

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