All Questions

1
vote
2answers
25 views

Do Public Land Survey System Townships have names? If so, why are they often left out of shapefiles

I am having trouble identifying names for PLSS townships. I am beginning to think it is because I am confusing political townships/PLSS townships/others. Could anyone clarify whether or not PLSS ...
0
votes
1answer
29 views

After I give kring command, this error comes up: data item in gstat object and newdata have different coordinate reference systems

> library(gstat) > library(readxl) > library(sp) > library(rgdal) #2013(FATALITIES) data <- read.csv("C:/Users/sbs/Desktop/Study/RA/Accident analysis/New folder/Iowa total crashes ...
0
votes
1answer
23 views

Converting DXF to KML with ogr2ogr

I want to convert DXF from AutoCAD to KML. It works but the coordinates don't come out right when I compare them to a KML produced with global_mapper and consequently it is shifted some when uploading ...
1
vote
1answer
48 views

QGIS Label Expressions

I'm trying to create a label that will show the following: MP 23.6 The "23.6" is a double type column in my table, the "MP" is the text I want to add in front of it of the number (milepost). I am new ...
1
vote
0answers
24 views

ST_3DClosestPoint for all Linestring Vertices and another Linestring

I want to get the closest point for each vertex of one linestring (table2) and another linestring (table1). So far, I have came up with the folowing query but it works only for one point and If i ...
1
vote
1answer
33 views

Filtering fields from a PostgresSQL/PostGIS database layer in QGIS by Query builder

I incurring in an error while trying to make the following filter of fields in the layer properties Query builder in QGIS 3 from a PostGIS database. select "field_A", "field_B2", "field_D" from ...
0
votes
0answers
16 views

Chrome v75.0.3770 render problems OpenLayers v5.3.3 [on hold]

After Chrome auto updated to v75.0.3770 today from v74 none of the layers render properly. There are blotches of odd shapes and partially correct map and feature renderings. I even tried a simple ...
0
votes
0answers
30 views

Iterating Loops in ModelBuilder of ArcMap 10.6.1?

I am trying to iterate through rows of a table, amass a list of distance values and then use those values as the Distance parameter in the Multiple Ring Buffer tool. All of this works great, except ...
1
vote
0answers
21 views

PyQGIS standalone - GDAL_DATA failure to retrieve gcs.csv using the QgsCoordinateReferencesSystem

I'm writing a standalone PyQGIS application. In order to set the project CRS, I'm using the QgsCoordinateReferenceSystem class. I tried all the possibile methods to assign the crs I want (which is ...
1
vote
1answer
24 views

What is the OpenStates API rate limit?

I have a project where I need to use the OpenStates API to retrieve information. The code is written and works, I just need to know what the rate limiting is before I turn it on. I have read through ...
1
vote
0answers
39 views

Shapefile not showing in proper location

Working in QGIS 3.0.1; I just switched to QGIS and am trying to get used to it. I have a shapefile from SW Maps app of a track walked on hiking trails, and am attempting to make a basic map using ...
1
vote
1answer
36 views

How aggregate data in a geodataframe by the geometry in a geoseries

I have a geoseries where each row is a (square) polygon. Housing price data is in a geodataframe where the geometry is a polygon of the zip code. I need to aggregate the housing price data by squares ...
1
vote
1answer
18 views

Openlayers 5: zoom view to features in a layer

I'm adding a number of features (linestrings and points) to a layer and I want to zoom/pan the map view to the extent of those features. I thought I'd have to do the following: var map = new ol.Map({...
1
vote
0answers
24 views

qgis gdaltransform versus OSGeo.OSR.CoordinateTransformation

I have implemented a simple coordinate transformation test in c# using GDAL 2.4.1 downloaded from https://www.nuget.org/packages/GDAL/. When comparing the result with gdaltransform (QGIS 3.4) and EPSG....
1
vote
1answer
33 views

Convert GeoJSON directly to geodatabse

I'm looking for a way to convert a GeoJSON File (from overpass-turbo.eu) direktly into a Feature Class in an Esri geodatabase. Normaly I'm doing this by loading the GeoJSON into QGIS, Export it to a ...
0
votes
0answers
59 views

Raster Dataset Misalignment (ArcGIS)

We have an ArcSDE Raster Dataset of aerial imagery covering a County. A little while back the dataset somehow got tweaked to where it doesn't align correctly anymore. It is in the NAD83 StatePlane ...
0
votes
0answers
25 views

Search widget propagation issue in IE 11 and Edge

I am currently using the esri search widget provided through version 4.11 or the ArcGIS API. This widget is used within a map that is held within several online forms. These forms contain custom ...
0
votes
1answer
24 views

GeoPandas intersect not working as expected

Using GeoPandas 0.4.0 with Python 3.5, I'm finding that geopandas.intersects does not behave as I expect it to. For example, a buffer around Switzerland does not appear to intersect with neighbouring ...
2
votes
1answer
48 views

QGIS displays satellite data very blurry when ArcGIS Pro looks clear?

I am looking at a WorldView 3 image in QGIS (right in image) and in ArcGIS Pro (left) and there is a huge difference in quality. QGIS looks so blurry/a lower resolution. Any idea what's happening?
0
votes
1answer
20 views

List index out of range when converting layers as a service definietion

In ArcGIS Pro python window: I'm adding certain layers into a list. From that list, I am converting the list in a service definition draft. I use this same script all the time, sometimes I'll get ...
-1
votes
0answers
35 views

Any current research on accounting for geological impacts on LiDAR based stream mapping techniques? [on hold]

Can anyone provide me with a group of scientists/scientist researching the impact of geology on LiDAR based stream mapping techniques. For example, half of our local county is underlain by karst ...
2
votes
0answers
46 views

Making CSV used as query for selecting some features?

layer = qgis.utils.iface.activeLayer() selected_features=layer.selectedFeatures() print layer.name() l = [] for i in selected_features: l.append(i.attribute("ID")) print(l) When I run this in ...
0
votes
1answer
24 views

canvas.toBlob(function(blob)) is giving SecurityError: The operation is insecure

I'm trying to get the image of Map from OpenLayers 4.6.5 and the following error is appearing each and every time. I'm using cdn link of OpenLayers 4.6.5 for the base Map in JavaScript with Apache ...
-1
votes
0answers
21 views

SurfaceArea function of R giving very big unacceptable area for DEM?

I have been trying to calculate DEM area using surfaceArea function of R. It is giving a very high unacceptable erroneous area. I have a 10 m by 10 m USGS DEM file. I read the DEM using raster() ...
1
vote
0answers
14 views

Landcover Legend

When I download landcover, the legend for pseudocolouring is always a number rather than the actual legend which was shown where I downloaded the data. How would I go about getting the actual land use ...
3
votes
1answer
35 views

Setting a Background Color with RVBT field with python

I'm trying to set the color of a background of a layer. To do this i created an attribute "Color" with the RVBT numbers associate to each feature. As in the picture, i want to set the color with those ...
2
votes
0answers
20 views

Open GPKG, query layers and save to new GPKG

I have recently started to use SQL and geopackages queries in R. I know how to open it, access the individual layers (geometry and tables), and select and process individual layers. But, I don't know ...
4
votes
0answers
49 views
+100

WFS not working on QGIS for datatables

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 ...
-2
votes
0answers
12 views

Remote desktop connection connection problem [on hold]

I have created an account at AWS. I have launched one instance of EC2 at AWS. It is running. but when I want to open "remote desktop connection" it is showing following error: How can I solve this ...
1
vote
1answer
20 views

Estimation value of simple kriging are constant in geostatistical analyst (ArcGIS)

The objective of my study is to compare the accuracy of the model SK (simple kriging) and OK (ordinary kriging). When I use OK to apply on my data, there is a little bit variation on the prediction ...
0
votes
1answer
35 views

Geographic coordinates in PostGIS to QGIS and shapefile layers

I've got in PostgreSQL/PostGIS the table "points" with latitude and longitude fields. I've done update points set geom = st_point (longitude, latitude); and also select updategeometrysrid ('points'...
0
votes
0answers
40 views

Show map data in QGIS

How can I open new Map? I did the following steps: Opened QGIS Add Vector layer Make Mar LQAS in csv file Make Mar LQAS in shp file The Map is still not visible.
2
votes
1answer
27 views

PyQGIS standalone app with pycharm : exit code -1073741819 (0xC0000005)

I try to run standalone PyQgis code with PyCharm, but I always have this result : Process finished with exit code -1073741819 (0xC0000005) I tried my code line by line, and this result appear after ...
-1
votes
0answers
32 views

Coordinates do not show up as project CRS coordinates after loading in more recent QGIS version [on hold]

Ok this is driving me crazy here. I had a number of installations on Windows XP, running some LTR release of QGIS 2.8. In all installations, on-the-fly (OTF) coordinate systems transforms were enabled....
1
vote
0answers
15 views

Create kmz with coordinates from images and thumbnails for symbols

I have about 110 geotagged images and am looking for an effective way to create a .kmz which contains for each image a point based on its geotag and uses a thumbnail of the picture as symbol. Clicking ...
2
votes
1answer
39 views

ST_Intersection + ST_Difference + not overlapping Polygons

I have a PostGIS table with some overlapping polygon and need a PostGIS view where no polygon is overlapping and the data is aggregated (like in the picture). With a Union of ST_Intersection() and ...
2
votes
0answers
18 views

Change corner coordinates GEOTIFF

I have a geotiff and I have the corner coordinates set using gdal_translate and the a_ullr argument setting out the min/max long/lat. This provides a bounding box for the geotiff to be projected. But ...
0
votes
0answers
18 views

Fieldmapping for mean and max using arcpy

I'm trying to spatial join two features. One polygon layer and one point layer. The point layer contains one field of values that I want the Mean and Min of. Im trying to use the fieldmaper object to ...
0
votes
0answers
24 views

Converting shapefile to .grd file?

I am new in ArcMap while using R Crisis software. I need to convert a shapefile into a .grd file. I read back the previous questions and answer and tried to execute and pop up that it was ...
0
votes
0answers
22 views

MapQuest how to display 10 cities routed in a way that at the end we route back to the first city [on hold]

How do I display 10 cities routed in a way that at the end we route back to the first city? I am interested any solution that will solve my problem. Google Maps / MapQuest solution
0
votes
0answers
26 views

Getting exact geographic boundaries of country? [on hold]

I am quite new to Google Earth Engine and l am doing a study on Sudan related to large area precipitation and vegetation dynamics, arguably a time series analysis but how to filter the boundaries of ...
1
vote
0answers
25 views

Error when reprojecting raster (warp) QGIS

When trying to reproject a raster from degrees to meters in warp (QGIS) I receive the following error: Processing algorithm… Algorithm 'Warp (reproject)' starting… Input parameters: { 'DATA_TYPE' : ...
0
votes
0answers
34 views

Improving speed of GeoPandas dissolve?

I am trying to dissolve grid spaces by category using GeoPandas' dissolve function, but it doesn't finish after hours of running and I want to make sure I'm not doing something wrong and/or there isn'...
2
votes
1answer
86 views

Change boolean value in QGIS by CASE WHEN

I'm trying to change a field value by the next conditional SQL script from a PostGIS database in QGIS Field Calculator: case when "Field_1" = 'YES' then "Field_2" = 'True' else "Field_2" = 'False' ...
1
vote
0answers
22 views

Change order display QGIS

Can I change the order of how my coordinates will display on QGIS? I would like to display Latitude, longitude instead of longitude, Latitude
1
vote
1answer
13 views

Changing font in QGIS2threejs

In QGIS2threejs,I want to change the fonts in 3D presentation.I learned that I can do it by change it in the css file through Different fonts in QGIS2threejs when I change the color and font,it doesn'...
1
vote
1answer
20 views

Fit the background map to the container

I am using Leaflet library to render states shapes. I am using OSM for background. I am setting noWrap:true for tile layer as I want to see only one background map covering entire world. Now I would ...
1
vote
0answers
32 views

How to convert a single band to multi-band raster?

I have paletted or unique values but they are not different bands. Now, I want to convert this band 1 (Pallette) to different bands based on the value (0-17). Can anyone help me in this regard?
-1
votes
1answer
31 views

How many cells with same color in raster map

I'd like to see how many cells have the same color based on my classification. An example is shown here: You can see the count figure under the raster map.
0
votes
0answers
13 views

Getting out of range output for EVI calculation based on Landsat 8

I will be using this stuff for an MSc project where I am looking at changing EVI over a four year timeperiod in 4 sites in the Amazon to look at changing rodent species abundances. I have got to the ...

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