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Is there a maximum number of polygons that can be plotted using Folium/Leaflet.js from a JSON file?

I have 15,000 parcels that I am trying to plot on a Folium map that is being served via Flask. I've imported the geojson as a layer, but when I include all 15,000 polygons, the map doesn't load. If I ...
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0answers
3 views

Is there a way to clean up the geoserver? I have got two WFS Stored Queries with the same ID name that I can not delete

There is something strange on my GeoServer. I have got two Stored Queries with the same id names myikkdll. I think I created it while I tested. The ListStoredQueries Request shows me this. <?...
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0answers
5 views

High quality photos using QFIELD

i'd like to take high quality photos with my tablet/smartphone during a survey with QFIELD. But i have some issues because with the camera used by the App, i cannot zoom in/out and the quality is bad,...
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1answer
9 views

Conditionally labeling layer based on three fields

I am labeling our power line span layer based on the conductor/wire type. This information is located across three fields in the span layer which represent phases A,B,C. Basically I want code that ...
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0answers
7 views

Where_Clause expression working for one FeatureClassToFeatureClass_conversion export but not another

I am attempting to export a feature class to both a shapefile and feature class with a where_clause restriction on particular values within particular fields. I have written a function to take dataset ...
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0answers
5 views

Bounding Box — Understanding (setting) Unit of Measurement in QGIS

QGIS Version 3.4 My initial problem (width and depth of parcel polygons) was solved by this post: However, when I run the process the Units of Measurement are unclear. (see below) Moreover, I want ...
1
vote
1answer
13 views

“Wrong or missing parameter value: Input layers”

I get this error message when I try p. ex. merge layers or package layers (processing) into geopackage. When I set files from a directory I don't have this problem. Am I missing some configuration? ...
0
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0answers
4 views

Mapbox GL JS Heatmap Label

I am working from this example on the Mapbox documentation page and I have managed to get points labeled onHover, but have not been able to get the actual heat map layer itself to display information ...
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0answers
6 views

PostGIS erase/difference vector polygons from raster

I have a raster and a vector table in Postgres 12 PostGIS 3.0 The vector polygon(orange) overlaps the slope raster(grid in black, whiteish) All I want to do is cut out/erase the polygon from the ...
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0answers
7 views

QtDesigner is not starting for qgis bat file

The qt-designer.bat file did not launch the QtDesigner. I have tried the file available with OSGeo4W64 installation but the qt-designer did not starts.I also try to start the qtdesigner from the ...
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0answers
10 views

Failing Unions due to Non-Noded Intersections

I'm trying to perform lots of unions in GeoPandas. I've got around fifty sets of between 7-12 GeoDataFrames of the same place at different times that I'm trying to union into one layer per set. Right ...
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1answer
16 views

GCS Sphere EMEP vs GCS WGS 1984

NOAA provides QPF data on rainfall in the form of shapefiles. The shapefiles include .prj files with information on the coordinate system used: GEOGCS["GCS_Sphere_EMEP",DATUM["D_Sphere_EMEP",SPHEROID[...
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0answers
5 views

Calculating area weighted average slope in ArcGIS (Using the Python window)

I am attempting to calculate an area weighted average of slope for multiple polygons in ArcGIS. There are no plugins available to do this and I do not know how to write a code for this in Python. How ...
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0answers
11 views

QGIS geometry generator - chainage nodes and labels along line at ellipsoidical distance

All points along line solution proposed in other question or plugin or processing toolbox use projected distance and not ellipsoidal. I work with very long lines and is quite important that the ...
0
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1answer
17 views

Performing one-to-many join with address and crime data using ArcMap

Goal: I want to show the police calls coming from a parcel on ArcMap. So if you click on the parcel, it will show all the calls for the year. I want to join the address attribute from the parcel data ...
1
vote
1answer
16 views

SAGA difference tool in QGIS

I am using QGIS 3.4 Madeira. I want to use difference tool from SAGA from the processing tool box since my data has some invalid geometries and want to fix the issue later after using difference tool ...
2
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0answers
9 views

Can Project Home variable be used to save default outputs of QGIS graphical modeler

Is it possible to use the @project_home variable in QGIS to set a default file path location for an output in the graphical modeler? Ideally I would like the default to be the project home folder ...
0
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1answer
15 views

Using.divide to band math and output image is one color image using Google Earth Engine

When i used the.divide function to a previous substract of bands, my output result in the Map.addLayer is a totally full green square in the previously defined geometry. I've used this similar code to ...
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0answers
10 views

Can OpenLayers display tiles from UK's Ordnance Survey [closed]

Does anyone have practical experience of using OpenLayers, together with tiles based on data from the UK's Ordnance Survey, without having to generate or host one's own tiles? If your answer is yes, ...
2
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0answers
16 views

QGIS 3 shows and saves raw default-values from spatialite-tables

QGIS shows default values from sqlite tables as string in the edit-form when i try to create a new row. After save, the raw default values are stored in the table. How can i edit in QGIS LTR 3.4.7 a ...
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0answers
18 views

Retrieving vertices of raster features using python and GDAL

I have a raster map like the one shown in the picture. I would like to get the coordinates of the four vertices (A, B, C, D) of the white polygon using python. The value of the pixels of the white ...
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0answers
9 views

Developing QT application with QGIS

I want to develop C++ QT(widget or quick) application which uses QGIS. However, i could not find any resources about how to merge each other. Can you help me? Link, method, example etc. will be ...
0
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1answer
23 views

Calculate Field - Why does the field populate with the same number, but prints correclty?

Why does the field populate with the same number, but prints correclty? import arcpy import rivers arcpy.env.overwriteOutput = True arcpy.env.workspace = r"C:\Data" import math def sinuosity(shape): ...
1
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0answers
7 views

Adding a Virtual Layer queried from a SQL Server View in QGIS project

I would like to add a virtual layer in a QGIS project that is defined by a query. It is sourced from a View (no geometry), which is then joined to a spatial layer for the geometry. The View and ...
0
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0answers
9 views

How to calculate AVG, MIN, MAX and SUM of polygons using SQL commands in PGadmin [closed]

I have to find out the Minimum, Maximum, Sum and Average of a list of areas using SQL but I so far have only been able to order by descending area. It seems like it should be so simple but I am really ...
1
vote
1answer
20 views

Obtain slope and aspect for points in QGIS

I'm new to QGIS. I have GPS points uploaded to QGIS and a ⅓ arc-second DEM (USGS) of the area. I'd like to generate slope and aspect data for each point. What is the best way to do this? The point ...
0
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0answers
12 views

How do you import GEE python coordinate data into QGIS?

I have a .csv file with data and coordinates for that data in GeoJSON format: {"geodesic":false,"type":"Polygon","coordinates":[[[-76.24486906575804,39.72835276629949],[-76.2445995711728,39....
2
votes
0answers
12 views

ogr2ogr sql query from dbf

In ogr2ogr, I can successfully read *.DBF files and write them to PostgreSQL DB: SET DBCONNECT=host=bla port=blue dbname=blub user=me password=easy active_schema=now SET PGCLIENTENCODING=UTF8 SET ...
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0answers
22 views

Projection to create a grid in km

I am trying to create a 1km2 grid of Kenya but I'm struggling. I have changed the projection to EPSG:32337 but this makes Kenya about 10 metres long which is obviously not right and leads to an error ...
-1
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0answers
9 views

PIX4D error in coordinates [closed]

after loading the coordinates in the local system into the PIX4D program the program builds a model with an error of 4 km Where there may be an error
0
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0answers
7 views

Performing supervised classification using Google Earth Engine [closed]

I would like to verify the accuracy of the model I created by comparing the data originating from the model with the data I collected. I thought for this aim to supervised classification. Following ...
0
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0answers
7 views

How to be notified of a change that is made on an alternative in another session in GE Smallworld?

I have two Smallworld sessions (Core 4.x) both are on same alternative, the first one has made the alternative writable and the other one is obviously in readonly mode. I want my readonly session to ...
0
votes
1answer
13 views

Neighbourhood statistics in google earth engine after reclassifying (remap)

I want to reclassify a categorical raster in Google Earth Engine, and then calculate the proportion of non 0 pixels in a neighbourhood. I've remapped to values of 1 or 0 (but could also be NA if that ...
0
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0answers
23 views

How to make a simple square projection with specific coordinates in QGIS

I have been looking for ways to make our own projections but I always find complicated answers. I am a beginner and I am looking to make a simple square projection of 12288 by 12288 with x=0 and y=0 ...
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0answers
10 views

Iterative bootstrap validation for classification in R

I classify a satellite image using Random Forest in R. To better estimate the accuracy of the classifier, I would like to carry out classification procedure which will be repeated 100 times with ...
0
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0answers
5 views

Reprojecting raster using gdalwarp “EPSG_Code: 6204”

I want to reproject a raster using the projection of other raster using gdalwarp, however, I am confronting some problems because the raster does not line up when loading them into a GIS Software. ...
0
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0answers
4 views

Plot different Layers from `RasterStack`-Object in R

Is there any way to automatically plot each layer from a RasterStack in R. I'm a little bit lost in the vast amount of options. There is tmap, mapview and also leaflet... For example if you have a ...
0
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0answers
26 views

Is project more Leaflet or OpenLayers or Map Server friendly? [duplicate]

I have several tables in a database on PostGIS. I want to create a website where the users can log-in, show the layers they want and filter the elements of the layers based on the fields of the ...
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0answers
10 views

How to create updateable/inseartable view on QGIS with a sequence id?

I have a huge point dataset that takes a long time to insert new stuff when using QGIS This table has an id column of type serial To go around this problem I've created an empty view that has the ...
0
votes
0answers
7 views

Unable to execute QGIS algorithm while taking Input raster directly from AWS S3 account

I have a raster file (.TIF) in my AWS S3 account. I am using GDAL to open that .TIF file and to save the reprojected .TIF file to my local computer using QGIS GDAL 'Warp (reproject)' algorithm as ...
3
votes
0answers
20 views

Manage multiple users connecting on multiple Postgis database via QGIS

I have a question about QGIS projects and how to manage multiple users (fifteen users with usernames and passwords connecting to the same five databases in PostGIS). Right now, there is one project ...
3
votes
2answers
30 views

How to merge overlap polygon respectively in one shapefile in QGIS

I want to merge the polygons of one shapefile if they overlap, but I don't know what to do. I try'dissolve' but get only one final polygon. This is not what I need. I want to merge them respectively.
1
vote
0answers
21 views

Building Raster Attribute Table (RAT) from GeoPandas dataframe with rasterio or GDAL

I am trying to figure out how to generate a RAT for a 1-band raster with rasterio or GDAL given a GeoPandas dataframe. My GeoPandas dataframe has 4 columns (X, Y, PERC_VALUE, LANDUSE_LABEL) which I ...
1
vote
1answer
28 views

Select features matching the values in an array (QGIS 3.10 expression)

I want to use an expression to select features matching the values of an array. Select features from a list is done by the IN operator: "field" IN ('value1','value2') But how to select features ...
-1
votes
0answers
15 views

Aerial Thermal video into QGIS [closed]

I want to capture aerial thermal video and use QGIS to get GIS format. What are the capture parameters? What is the process of getting the GPS and meta data into QGIS, making SHAPE FILES and viewing ...
-1
votes
0answers
10 views

Automation of tracing of line up to point layer in ArcGIS Desktop [closed]

Problem- It a Water Network Distribution system. I’m doing network tracing manual work in ArcGIS since a long time and want to automate it. Can you help me with any trick or python or VB script? ...
4
votes
0answers
23 views

ST_Covers fails on column with GiST index, PostGIS 3.0

I'm trying to upgrade to Postgres 12 with PostGIS 3.0. Unfortunately, I can't get my spatial queries to work. There seems to be an issue using ST_Covers on a column with a GiST index. Proof of ...
1
vote
0answers
9 views

Dynamical refresh of Mapbox layers after drawing edits

I fetch some GeoJSON from a DB, and add them to my map. After I use the mapbox-gl-draw library for editing. My problem is that, after editing a feature on the map I would like to directly change it (...
0
votes
1answer
43 views

How to get city boundaries of Europe?

I am looking for an up-to-date communes administrative boundraries (LAU) of several countries in Europe (France + adjacent countries). I need it to be quite precise (less than 5m), since I intend to ...
2
votes
1answer
19 views

Leaflet WMS JSON transparent rendering

I am displaying from Geoserver a WMS layer into leaflet in a PNG Format: var app_coup = L.tileLayer.wms("http://localhost:8081/geoserver/cite/wms", { layers: 'cite:...

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