All Questions

1
vote
0answers
4 views

Referencing an output in an expression in process modeler

In the process modeler, I'd like to reference an output of a previous step as one of the parameters of an algorithm. In this case, the previous step was clipping a large raster and I want to use the ...
0
votes
0answers
6 views

Grid net contour/outline QGIS

How to make a contour/outline of grid net polygon? Just need a thick boundary of the grid net to make the result more "beautiful". I tried to do it somehow in symbology, but unsuccessfully.
0
votes
0answers
5 views

Qgs Vector Data Provider capabilities not available

I am trying to use deleteAttributes on my vector layer to delete attributes. But it does not work - the attributes are not deleted. layer.dataProvider().capabilitiesString() gives the following ...
0
votes
0answers
4 views

TIGER/Line GeoID - Census Tract map to Lat/Long

I'm working in Python with ACS data downloaded from here: https://www.census.gov/geo/maps-data/data/tiger-data.html I was able to convert the geodatabase format to a pandas dataframe where every row ...
0
votes
0answers
6 views

Create continues Line network using PostgreSQL

I have shapefile which doesn’t have continuous network. I want to connect it to the nearest node and create continuous line from it. Is there any step by step material which I can followed? From my ...
0
votes
0answers
7 views

Incorrect coordinate reference system

Used to be able to define layer coordinate reference system fine in previous versions GQGIS. I can still add some vectors in 3.4 with correct reference systems but no rasters.
0
votes
0answers
5 views

GRASS GIS - Keep raster below/above surface

I would like to clip raster where the surface intersect another surface and keep elevations that are below only. I am interpolating a vector into a 2D raster (v.surf.rst) for properties at a given ...
0
votes
0answers
8 views

QGIS - Scanning speed of MSSQL Connection

I notice in QGIS (currently using 3.4.2) when connecting to a SQL database it takes a while to load all of the layers as it scans through the database, meaning if I go to select a feature to drag into ...
0
votes
0answers
6 views

QGIS SQL Server Connection Not Refreshing

In QGIS 3.4.2 and previous versions, if I make a change in SQL Server such as adding a new SQL table with geometry, I cannot get QGIS to show this change. Refreshing, deleting and readding the ...
1
vote
1answer
18 views

ArcGIS not connecting to PostgreSQL db with all upper-case name

We've been trialling ArcGIS at work and are just about to buy. However, we have a PostgreSQL database which contains a lot of stuff we work with, which is named in all upper-case ("GISSTUFF", for ...
0
votes
0answers
12 views

Creating Title Blocks in QGIS

I am trying to create a table in composer to be positioned at the base of the map and is essentially a title block to provide information in text, image and table form. The only success I have had is ...
0
votes
0answers
5 views

How can I put the jetty-servlets.jar file onto the CLASSPATH

I want to implement popup for WMS layer in Leaflet but I encountered a 'Access-Control-Allow-Origin' problem so I searched in the Internet I found that I have to add this to web.xml : <web-app> ...
-1
votes
0answers
21 views

Is there any way to extract files from damaged backup.img file? [on hold]

I have a raspberry pi backup.img file that I was trying to extract some of its inside files, I used different softwares to do that but all failed. I used Winzip but I got a message sys that this file ...
0
votes
1answer
25 views

QGIS - Vector Menu no longer working

The Vector menu no longer works. All the other menus drop down and show the different options available. Here is the error message shown upon startup. I do not know if this is linked to the Vector ...
-1
votes
0answers
14 views

Seeking Sewer and Water GIS Data?

Is there such thing as a national or statewide GIS data set for existing sewer and water lines?
-1
votes
0answers
19 views

Using network analysis?

I am currently working on walkability indices which includes only properties of the built environment. This means that anything which is non-physically built is neglected (socio-economic properties, ...
0
votes
1answer
8 views

Filtering out labels surrounding active feature in Atlas

I am using QGIS version 3.4 to create atlas maps utilzing a polygon coverage layer of 19 watersheds. Everything works fine in layout as I can jump/zoom to each desired watershed map. Furthermore, to ...
0
votes
1answer
18 views

Unable to plot in R some locations over a shapefile

I have a shapefile of polygons that I got from here, and a CSV file with longitude, latitude data (i.e. lon= -71.4; lat=42.5). The shapefile has the following CRS information: "+proj=lcc +lat_1=41....
1
vote
0answers
11 views

vectortiles: change style of basemap instead of data

I'm using Mapbox-GL-Leaflet bindings on Leaflet to style my vector tiles. I'd now allow the user to switch a style using Leaflet control. The easiest way would be to use LayerControl for this. Since ...
0
votes
1answer
17 views

Using dynamic label to give all results in capital letters?

I need this dynamic label to give me all the results in capital letters: [dyn type="page" property="attribute" field="Predio" domainlookup="true"]
-1
votes
1answer
19 views

Seeking population data for Detroit?

I need population and age breakdown data for Detroit. I have found census tract shapefiles but none with the attribute data that I need. Any idea where I might find such data?
0
votes
1answer
14 views

PostGIS cannot create extention:ERROR: cache lookup failed for function 1

When trying to create PostGIS extension I am getting this error: ERROR: cache lookup failed for function 1 I am running PostgreSQL 11 on Ubuntu 16.04. I have installed PostGIS and PostGIS scripts. ...
1
vote
1answer
20 views

How do I transform an EPSG:3857 world map to an EPSG:4326 ECE world map?

This follows up a question posted over seven years ago. The results look very similar to the original inquiry without an answer or update I could test successfully. I made a custom stylized EPSG:3857 ...
0
votes
1answer
11 views

Configuring MapServer on Ubuntu with Apache

I am using Ubuntu 18.10 /x64 / Apache2. I wish to install MapServer on my system. The packages can be obtained from this place: https://launchpad.net/ubuntu/+source/mapserver/7.2.0-5/+build/15292173 ...
0
votes
0answers
6 views

Loading Landsat 8 mosaic in Google Earth Engine

I created a Landsat 8 mosaic in Google Earth Engine code editor and I want to see if this mosaic is in to Google Earth Engine Explorer for classification. How can I do that?
-1
votes
0answers
10 views

Integrating custom tool for modeling or processing Earth Observation data in Open Data Cube? [on hold]

We are developing some modeling and processing Earth Observation data and want to integrate with Open Data Cube. But we cannot find any detail document to guide us do it. Can anyone show us how to ...
-1
votes
0answers
14 views

Panels turn invisible [on hold]

I have a problem with the 3 panels I use : 1) Layers panel : I have a project with the Layers panel visible. When I close the project, and open it again, the panel is not visible any more. I can get ...
0
votes
2answers
29 views

Joining QGIS Property Parcel Mapping shapefile to an Excel file and displaying symbol in Parcel Mapping Shapefile

I am new to QGIS. I am a land surveyor and I have all of the property parcel mapping information in a shape file for my area. I am trying to link/join an Excel file which has all of the survey files ...
0
votes
1answer
16 views

Deselect previous selection in OpenLayers

Previously we did when you click on a geometry on the map to color in another color and zoom on geometry. But now you should deselect the previous selection in the original color in which the map was ...
-3
votes
0answers
19 views

ROC AND AUC VALIDATION FOR SUSCEPTIBILITY MAPPING [on hold]

How do I validate the susceptibility maps created using frequency ratio method? I had FR values, the test and training data. How can I validate the maps created?
0
votes
0answers
16 views

Extract latitude and longitude from rotated coordinate system

I'm new to working with geographic data so please bear with me. I have the following data: bnds,projection_x_coordinate,projection_y_coordinate,realization,fog_area_fraction,...
2
votes
1answer
11 views

Changing metadata using ArcPy of ArcGIS Pro?

Is there any ArcPy function or classes which allow us to change map and layout metadata within ArcGIS Pro?
0
votes
0answers
22 views

“OGR: not enough data error” when using st_transform in R

I'm trying to use st_transform (from the R package sf) on a sf object and am getting the following error when projecting from WGS 1984 to Albers Equal Area: > sf_obj_prj <- sf_obj %>% ...
1
vote
1answer
14 views

Exporting to PDF using ArcPy of ArcGIS Pro?

I have a weird issue in exporting the layout to PDF My code is really simple and I have tried in ArcGIS Python IDLE but I have came across the problem. My Code and error is : Code: aprx = arcpy.mp....
0
votes
1answer
9 views

Combining different coordinate tables/maps into one table

I am working on a project which has now seen a change in the geographical boundaries, polygons, eg regions, whereas I have particular customer long/lat data relating to the old boundaries. How do I ...
0
votes
0answers
32 views

Overpass API query for `osrm-extract -p foot.lua`

The OSRM demo server only support the car profile, and I need to create walking routes in various different places of the world. I don't have the hardware needed to process the whole Planet.osm, ...
0
votes
0answers
11 views

Drawing polygons with specific heights and widths in ArcGIS Desktop?

I have a dataset that defines my plot corners. Within each plot, there are a number of subplots, each with specific dimensions. I need to create polygon shapefiles for each of the subplots. Is there ...
1
vote
0answers
4 views

Correcting ColorInterp on Jpeg2000 NAIP imagery using .aux.xml

Using GDAL 2.4.0 with OpenJPEG 2000 v2.3.0. gdalinfo reports all four bands of NAIP imagery as "Unknown" colorinterp. Sample image here: https://prd-tnm.s3.amazonaws.com/StagedProducts/NAIP/id_2015/...
-2
votes
0answers
10 views

How toi match mutiple column values in dataframe with dictionary values ? If mathed , tag as 1 [on hold]

I have data frame with responses to 10 questions , responses are multiple choice viz.() a, b,c,d,e and a dictionary with question and answer key. Now how to match the responses with answer key and if ...
1
vote
0answers
26 views

Generating surface area from irregular sides using R?

I want to frame my question based on the image below. I have 4 columns of data in Excel format -- a1, a2, a3, and a4. The 4 columns are the 4 sides of the image as shown, with the data representing ...
0
votes
0answers
7 views

Iterative Processing for make NetCDF table View in ArcGIS Desktop?

I am trying to process NetCDF file using Make NetCDF view table but do not understand where it stores output? I have 32 nc file for which I am using ModelBuilder.
1
vote
0answers
16 views

Getting attribute information from layer in OpenLayers [on hold]

I just want to add a layer that represents a city with its city districts. When the user clicks on a district, the site fires an alert presenting the population number. It looks like that: ...
0
votes
0answers
11 views

Specifying dimension for variable in NetCDF input file using GDAL?

I have a data which is in .nc format. I want to extract a variable which is in XxYxZ dimensions for example 4032x496x3 inside the netcdf file. But the problem is when using gdal_translate it is ...
0
votes
0answers
13 views

Saving QgsRasterBlock object as .tif, or to add it as QgsRasterLayer?

I am currently working on a qgis plugin and I need to simulate each pixel value in raster. I read that the best way to read each pixel value is by using QgsRasterBlock object and I assigned simulated ...
0
votes
0answers
14 views

Disconnect between raster symbology in Layers Panel and Layer Properties (QGIS 3)

I'm working on a Python plugin for QGIS that applies a customised colorRampItemList to a single band raster. The result displays correctly on the map and in the Layers Panel but incorrectly in the ...
0
votes
0answers
9 views

pyqgis processing, grass: --overwrite does not work

I have a QGIS plugin that tries to call the v.clean algorithm multiple times in a row and use the same output file each time the algorithm runs through. But even though I set the --overwrite parameter ...
0
votes
2answers
43 views

Selecting latest date with QGIS field calculator?

My shapefile contains columns like "Street", "number" and "date". What I want to do is, to find the latest date (where we have done house services). If we have 2 dates for one house number ("number")...
0
votes
1answer
29 views

What algorithm is used by the $geowithin operator of Mongodb

MongoDB can perform geospatial query such as finding restaurants inside region with the operator $geowithin. For example: db.places.find( { loc: { $geoWithin: { $geometry: { ...
-1
votes
0answers
8 views

Overlapping points converted into separate distance in ArcMap [on hold]

How can I convert overlapping points data into separate distance in ArcMap or PostGIS? Something like Disperse Markers in ArcMap but this is representation only. I need a shapefile.
-1
votes
0answers
10 views

How to change NoData cells to a value in a raster with ArcPy? [on hold]

I have a raster created from a point shapefile, so I have some pixels with specific values and others with NoData. I would like to assign a value to NoData (example: 12345) but I need that the other ...

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