All Questions

Filter by
Sorted by
Tagged with
0
votes
0answers
3 views

How can I visualize a raster coverage of PostGIS in OpenJUMP?

I am new to OpenJUMP and I am trying to use this software for visualizing PostGIS rasters. I was able to illustrate vector layers of PostGIS in OpenJUMP but I cannot illustrate raster tables. Do you ...
0
votes
0answers
9 views

Categorizing joined attributes using QGIS 3.8.2 Zanzibar

I have a joined layer that has 119 attributes. I want to categorize them into quintiles (5 equal groupings). How do I do that? I can't seem to find anywhere online that addresses how to do that using ...
0
votes
0answers
6 views

Invalid WKT polygon error

We are trying to load the data in solr through csv file. The data is in the below format. WKT(Its one column) POLYGON ((44225.300000005 61616.3199999181 0.0, 43615.3000000049 61616.3199999181 0.0, ...
0
votes
0answers
10 views

ST_Contains when linestring crossing itself

I have a linestring which crosses itself, like in the picture below. There isn't any vertice at the crossing. It is a MultiLinestring, so when I want to get the startpoint, the endpoint, or the ...
0
votes
0answers
7 views

Drawing lines between points in a shapefile that are related to each other

This is a more general question, wondering if it is possible. I want to make a map of all the organizations in my city and which ones partner together. I imagine I would make a shapefile that is a ...
0
votes
0answers
7 views

Plotting time series in GEE [on hold]

I need to plot a time-series data from a Sentinel 1 image containing four bands which corresponds to four dates for a single landcover classes(rice). I have a collection of points (4 points) ...
1
vote
1answer
13 views

Nearest line to polygon based on equal attribute

I have a polygon shapefile and a line shapefile with several thousand features each. I want to get: The nearest distance between a polygon and a line that have the same attribute (e.g. ID). Example ...
0
votes
0answers
8 views

Selecting text characters within a string, or multiple field characteristic results as independent values? [duplicate]

I'm working to map data out using information extracted from a database where values were input based on characteristics assigned by a reviewer. I'm looking at mapping characteristics of a building's ...
0
votes
0answers
19 views

QGIS 3.8 labels placement

On my layer the setting of the labels is: But all the labels do not appear, as if there was a limit on the number. Sample with some features Sample with all features: some labels have disappeared ...
0
votes
0answers
9 views

ArcGIS 10.6.1 Model - dissolving loop - Merge tool

I am having an issue with the buffer tool in ArcGIS 10.6.1. In the model I am running, there are several polygons that are merged with their own buffer to create a single .shp. The procedure to ...
0
votes
1answer
24 views

Best (Spatial ETL) Tool open Source [on hold]

What is the best Spatial ETL Tool opensource can I use it?
1
vote
0answers
27 views

Calculating the number of days between two dates as number

For some expression in QGIS I need to get the number of days between two dates as numeric value. If I substract two dates I get an interval back: to_date('2019-12-31') - to_date('2019-01-01') gives ...
1
vote
0answers
15 views

Finding the area where there are most polygons that intersect?

I am in the midst of an important research discovery. I have a shapely.geometry.multipolygon.Multipolygon object, and my question is two-fold. The first, how do I find cluttered areas in the ...
1
vote
1answer
16 views

Value Error when adding adding a layer in ArcGIS Pro arcpy script

In a script, I'm creating a feature layer and trying to add it to a map in ArcGIS Pro 2.3.0. When I try to add it though, I get a ValueError. Any ideas why and how to fix it? m is the map object. The ...
1
vote
1answer
11 views

Clip Square region from Point Geometry

I have a series of (lat, lng) coordinates and I need to extract 10x10 sq_km satellite imagery from them. Google Earth Engine (GEE) has this functionality: geometry = ee.Geometry.Point(lat, lng)....
0
votes
0answers
13 views

Problem reprojecting coordinates using DotSpatial

I'm trying to reproject some coordinates from EPSG:27700 to WGS84. I can do this fine in JS using the proj4 port, but I'm getting different results using DotSpatial. Here is my .NET code: var wgs84 =...
1
vote
1answer
13 views

Create Query either using Select by Attributes or Python

I am working on something for my job, where I have a list of water/sewer service customers. Some customers have one service or the other, while others have both which is stored as two separate entries....
0
votes
0answers
11 views

QGIS 3.4 3d not available

I'm running QGIS 3.4 Madeira on Linux Mint 17. The upgrade to 3.4 seemed to go smoothly, but there is no "3d view" option in my "View" menu. Is there something else I need to do? FWIW QGIS 3 J's ...
0
votes
0answers
8 views

Find Topology error in polygon layer

I try to find topology error in this polygon layer using QGIS 2.18: but i don't understand why with the Topology checker, only several areas marked in red, whereas i expect that also other areas (...
0
votes
0answers
12 views

Regarding extraction of shapefile [on hold]

I have one shapefile called A. I have another shapefile, B, which is a part of the former shapefile A but I want to extract portion of shapefile A which would be the result of shapefile A - shapefile ...
0
votes
1answer
26 views

LiDAR from WMS?

For my project, I must use LiDAR to generate 3D profile of terrain structures. I downloaded a 2m LiDAR WMS composite digital surface model available here: https://environment.data.gov.uk/spatialdata/...
0
votes
0answers
9 views

problems with my trimble geoexplorer hx-2008 I had the need to reset my computer and I lost it [on hold]

cirohumberto yahoo problems with my trimble geoexplorer hx-2008 I had the need to reset my computer and I lost it
2
votes
1answer
13 views

Appending linear ring to multipolygons in OpenLayers

I am trying to append linear ring to multipolygon. When I try to do same for polygon it works. case 'Polygon': linearRing=new ol.geom.LinearRing(...); select.getFeatures().getArray()[0].getGeometry(...
2
votes
0answers
33 views

Difference between $x and x($geometry)

I just stumbled across something weird: I had point-data in EPSG:3059 and wanted to add the coordinates to the attribute table using $x resp. $y - which returned NULL. x($geometry) on the other hand ...
0
votes
0answers
12 views

Is it possible to independently adjust the simple size in the legend for tmap?

When trying to plot a dotmap with tmap: tm_shape(points)+ tm_dots(col="party",title = "Votes (1 dot, 1 vote):")+ tm_shape(districts)+ tm_borders(alpha=0.5)+ tm_legend() I want the points to ...
0
votes
0answers
13 views

How to create a raster map in QGIS that includes the distance to the nearest road multiplied by another variable included in a vector file?

I am using QGIS (v. 3.4). I have a vector file (.shp) with the main roads of my city including the average traffic load of each segment. I would like to create a map with the inverse distance to the ...
0
votes
0answers
13 views

Reading LAZ file in Python directly?

I am able to read .las file in Python using laspy as below: las_filename = 'abc.las' inFile = laspy.file.File(las_filename, mode='r') But when I put a .laz file in this code, I get the below error: ...
0
votes
0answers
10 views

Iterate on Fire data (FIRMS) in Google Earth Engine

i loaded the FIRMS data in Google earth engine for the year 2018 and now want to know for a created AOI, when and if there was a fire there. My idea is to create a loop that shows me in a five-day ...
0
votes
0answers
10 views

ArcMap displays 0 0 Decimal Degrees for rasters with correct information

I have multiple rasters when opened in arcmap they show 0 0 Deciaml degrees at the right bottom of arcmap the information this is the same raster. what is problem?
1
vote
1answer
19 views

Problem with ''Split lines by points''

I'm trying to use the SAGA tool ''split Lines by points''. I have created the line layer using '' Polygon to lines'' My goal is to split the lines. I created points using Extract points I want to ...
0
votes
0answers
28 views

QGIS Project saved in PostgreSQL not loading on other computers

I have created QGIS projects that are reading from PostgreSQL(data source). I then saved the individual projects to PostgreSQL in the public schema under their respective databases. When I open or ...
0
votes
0answers
6 views

Find every possible user to user travel time duration using pgr_dijkstra or pgr_kDijkstra

I have this below GetNearest function that will get every user's nearest node from ways (imported using osm2pgrouting). CREATE or REPLACE FUNCTION GetNearest(NUMERIC, NUMERIC) RETURNS BIGINT AS ...
0
votes
0answers
14 views

API for grid-like data (eg HDF5, NetCDF) [on hold]

What would it take to set up a self-hosted API similar to NASA's POWER (https://power.larc.nasa.gov/docs/v1/)? I have data in HDF5/NetCDF formats (but I know they can be converted and/or imported into ...
0
votes
0answers
16 views

Tools for programmatically finding a large flat site using height map data

I want to find the best location for a large science experiment. It requires two long (multi-kilometer), flat "arms" about 20 m wide separated by an angle between 45 and 90 degrees. I want to use ...
0
votes
1answer
15 views

Connect GeoServer WMS data to Leaflet.js

I have WMS Layer in GeoServer, I've made it following the walk through tutorial in https://www.e-education.psu.edu/geog585/node/701 I'm confused on how to connect my WMS to leaflet.js.
1
vote
1answer
22 views

Landsat 8 images black?

I am trying to get cloud-free imagery for a specific region during specific dates. I am very new to GEE, but the script below seems to work. However when I look at the imagery that is then printed on ...
0
votes
0answers
13 views

Temporal combination of Raster files?

I have a set of time series raster files, and need to combine them using python. As an example my file's name are A1.tif, A2.tif, A3.tif... I want to combine A1.tif and A2.tif and after combination ...
0
votes
0answers
22 views

Error in adding PostGIS extension :- rtpostgis-2.4.dll could not be loaded

I need to created web based application to showcase GIS data using .Net technology. After going through couple of blogs and links, I installed Postgress 10 and PostGIS 2.4. When i tried to add ...
-1
votes
0answers
24 views

Lat/lng position on the road or on the sidewalk? [on hold]

Is there any way that I can get what kind of point (lat/long) I'm getting, I mean if the location I'm asking is in the middle of the road or on a sidewalk or on a building ?
1
vote
0answers
19 views

After creating tiles in QGIS by enabling VRT, I'm getting black color tiles [on hold]

I have a big TIFF image and I created tiles of size 512 X 512 but all the tiles colour is black I don't know why.
0
votes
0answers
13 views

Derive Event Measures Error Message?

Getting an Underlying DBMS Error message (ORA-20025: Not owner of state 1087699.ORA-06512: at “SDE.VERSION_USER_DDL” As anyone seen this type of error and how all the sudden would this become an ...
0
votes
0answers
22 views

Where to purchase USA geospatial data for city,states and highways

I need the US state, City and highways geospatial data for commercial use. Where do I get that kind of information?
1
vote
1answer
35 views

QGIS report composer to show related tables

Is it possible to include in the QGIS report composer a fields group section with tables that are related on a 1 to many relationship? For example a point layer "HOUSES", with a KEY that relates to a ...
0
votes
0answers
6 views

Adding RGB values from a .txt file to a .las file using laspy

I have a text file that has XYZ and RGB values in it. To convert it to .las format i use lfile = laspy.file.File(r"D:\las\tolas.las", mode='w',header=LasHeader(x_scale=0.01,y_scale=0.01,z_scale=0.01))...
2
votes
1answer
31 views

Quickly change my current location in the QGIS 3 browser

I use Windows Explorer to manage the contents of the folder, and the fastest way to change my current folder in different applications is to copy the folder path and paste it into the browser tab of ...
1
vote
2answers
75 views

Reading big raster getting warnings using GDAL Python

I am trying to use GDAL Python API to deal with some big raster, and when I read these rasters into Python, I get warnings like that: Warning 1: TIFFFetchNormalTag:ASCII value for tag "GeoASCIIParams"...
2
votes
2answers
37 views

QGIS Raster Georeferencer adds black padding to corners of adjusted black and white TIFF image

After georeferencing a black and white TIFF image, the QGIS Raster Georeferencer fills the corners with black pixels, creating black elongated triangles along the edges of the new image. I could not ...
2
votes
1answer
40 views

Finding sum of points values within distance from paths

I'm willing to plot public transport data for a university project, and I'm currently trying to find out roughly how many people live with a reasonable distance from a set of bus routes. I have my ...
1
vote
0answers
23 views

Importing raster data automatically to GeoServer

I'mtrying to make an automatic raster data import to GeoServer for later use in an OpenLayers web application in which i need to add raster files frequently, so I added Image Mosaic JDBC Plugin and ...
0
votes
0answers
13 views

Map download failed, Unable to download map. The operation couldn't be completed. Failed to create replica. Failed to create replica

I need help resolving this error: Error text: "Map download failed, Unable to download map. The operation couldn't be completed. Failed to create replica. Failed to create replica." I have a ...

15 30 50 per page