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votes
1answer
32 views

Converting Grayscale GeoTiff to PNG using QGIS results in all black image

I have a GeoTiff in QGIS that I created by merging some images inside QGIS. It looks like this: I use Raster>Conversion>Translate. And save it as a PNG. I then open the image in both, Photoshop ...
1
vote
0answers
19 views

QGIS 3.4.10 for Mac users…Digitzing polygons

I have just installed the LTR version of QGIS (3.4.10) and am having trouble telling QGIS when I have finished a polygon. In fact, I can't. It used to be in earlier versions that to end a polygon you ...
1
vote
1answer
21 views

QGIS failure in PostGIS connection: “ident authentication failed for user”

I am trying to use the 'ident' authentication of for local PostGIS (2.5) server, so that each user can connect to his/her account without having to provide password. The local connection (to 127.0.0....
0
votes
0answers
19 views

Converting geocentric coordinates to geodetic coordinates?

I would like to start by saying that I am very new to this. I have 160 different points which all have similar layout as below: at point | X= 153346.357 | Y=354912.111 | Z=0 | Doing some research I ...
1
vote
1answer
18 views

Setting correct start and end time series for Savitzky-Golay in R

I am trying to smoothen my raster stack using Savitzky-Golay method. I am following the workaround from HERE but my problem is setting start and end of my time-series raster. My series of images were ...
0
votes
0answers
12 views

Convert sounding depths from NOAA S-57 ENC to GeoTIFF

I want to rasterize an ENC I downloaded from NOAA (https://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml) in order to have a XYZ grid of sounding depths. I should think this is an easy process, ...
1
vote
1answer
30 views

Finding area between multiple polygons using ArcMap?

Fairly new to ArcMap 10.3, I'm trying to find a method to build a toolbox model to determine the area of flooding within a basin. The tricky part is that I need to remove the flooding within a pond. ...
0
votes
0answers
14 views

ArcMap crashing from multiple tools? [on hold]

Just uninstalled Desktop & Python27 folder and did full re-install. Still having this problem where ArcMap crashes when calculating fields, trying to open Geoprocessing Tools or Toolbox. Probably ...
2
votes
1answer
35 views

Shapefile to polygon, then edit the polygon in order to use it as a mold

I am working on QGIS with a shapefile: I transform it through Raster-> Conversion-> Polygonize Then I eliminate some parts (Sea), and those that are bigger than one single square of grid but are ...
2
votes
1answer
98 views
+50

Split Lines with Points PostGIS

I have a line table and a points table in PostGIS. I need to split the line table with the points table and return all geometries. Tried... CREATE TABLE lines_split AS ( SELECT a.seg_name, ((ST_DUMP(...
1
vote
1answer
26 views

Text element not updating in arcpy.mapping?

I am trying to get a text element to input an address using the below code. It seems that the code picks up the right elements, is finding the text elements I want to change but isn't able to actually ...
1
vote
2answers
61 views

Aligning an edge to match another edge

I'm new to QGIS and I wonder whether there is a tool that helps to adjust the edges between two or more polygons; similar to that topology tool that's used in ArcGIS. http://desktop.arcgis.com/en/...
0
votes
1answer
24 views

QField operating system

Does anybody know if Qfield can run on Ipad? My understanding is it was build to run on Android 4.3 or later version. Anybodu knows if it can run on with IOS?
0
votes
1answer
24 views

OGR2OGR - converting a GML file to GeoJSON

I'm struggling to use ogr2ogr to convert a GML file into a GeoJSON file. My input is zipped GML files with several layers. I'm only interested in the layer with name 'TopographicArea'. I've tried ...
0
votes
1answer
15 views

Rename store using REST API

So, it appears that I can rename a store name (both DataStores and CoverageStores) from the WebUI (v2.13.2 and 2.15.2) but I cannot do it via the REST API. It returns a 403 error when I do this: curl ...
0
votes
0answers
22 views

Customizing legend in layerlist widget of ArcGIS API for JavaScript?

Here is an example code that I use in my work. There are a few issues with this: The layer title appears one more time in the legend of layerlist. How can I remove it or change to other text? ...
2
votes
1answer
40 views

Network service area mapping over open ground

Given a timestamped start location, a timestamped end location and a known average speed is there any way I can map everywhere someone (or something) could have possibly been between the two ...
1
vote
0answers
31 views

Plotting CDF of the values in a raster (.tif) file, using Python or QGIS?

I have a tiff file with some values and I want to read those values and plot a CDF (Cumulative Distribution Function). So far I only know how to get the mean value from osgeo import gdal gtif = gdal....
1
vote
1answer
20 views

Spatial Join Polygon to Polygon with Centroids Inside features

I have a parcel feature class with +5M features. I want to spatially join it to a feature class of regions to check if the regional code matches that in the parcel data. I've tried using "have their ...
1
vote
1answer
44 views

Getting Projection Code (EPSG) from Coordinates and known location

I have Coordinates (x=3381438.573, y=5794542.432) and a location (somewhere south of Berlin). Is there a way to find out the Projection code this data was defined with? A website would be nice.
1
vote
1answer
40 views

Iterate a clip over multiple feature classes using Model Builder or ArcPy

I have multiple feature classes (buildings, airport, land, roads etc) that I would like to clip using a Local Authority boundary. I am trying to create a process in model builder or Arcpy that will ...
1
vote
1answer
28 views

Where has the QGIS2threejs Icon gone?

I am trying to create 3D maps. I am using QGis2threejs. I know I can also create a 3D map using 'New 3D Map View', but I want to try QGis2threejs. However I have two questions. When I install the ...
1
vote
0answers
18 views

Custom legend with concatenated fields on QGIS 3.8.1

I prepared a map with a custom legend on QGIS 3.8.1, combining a classification of several concatenated fields. However, when creating the layout compouser and including the legend, the descriptive ...
3
votes
2answers
83 views

QgsGeometry.length() giving wrong result?

I have a vector layer with Multilinestrings and used the field calculator to add a field ("length") with the calculated $length of each feature. I know the field values are correct. Now, if I ...
0
votes
0answers
26 views

Error: Unrecognized argument type to convert to a FeatureCollection: [object Object]

This code works in Earth Engine Code Editor, but it doesn't work in my server-side web app. I get Error: Unrecognized argument type to convert to a FeatureCollection: [object Object] //inputs is ...
-1
votes
0answers
31 views

Heat map with possibility of shading any country or province in the world?

My boss is collecting data which measures where visitors to our website are located. He wants me to make a choropleth map (I believe that's what it's called) in which countries and provinces are ...
0
votes
0answers
40 views

Converting multiple points to multiple polygons - ArcGIS Desktop 10.6.1

How can I convert multiple points to multiple (tiny polygons)? I need to execute a merge function and I need the points to be polygons so that the toolbox can do its job and join multiple polygon ...
-2
votes
1answer
30 views

Cluster Analysis on spatial data on R? [on hold]

I sampled a population of an insect in an area and got GPS points. Now I want to investigate if there are subpopulations within the pop using distance from points. I have a dataset with coordinates ...
1
vote
1answer
28 views

QGIS: Clip Raster by Mask Layer-permanently remove black edges

I want to introduce geotiff images generated in QGIS by clipping ortho imagery to a shapefile into matlab. However, the clipped raster images come with black borders. I managed to remove them in QGIS (...
0
votes
1answer
87 views

Length of intersections from a linestring and a grid shapefile by using Python geopandas & QGIS

I am using Python geopandas and I have two shapefiles. One of them is a grid file containing equal polygons. The other shapefile is a linestring file with several lines and its Attributes. The idea ...
1
vote
0answers
25 views

Resampling while drawing rasterfiles in QGIS 3?

I can not find a solution to resample my rasterfiles in QGIS 3. With Arcmap usually I use "resample while drawing" with the method cubic or bilinear interpolation for continuous data to smooth my ...
3
votes
1answer
35 views

Find duplicate point geometries in a shapefile [on hold]

How to find a duplicate point geometries in point shapefile (around one lakh geometries) using Python OGR/GDAL
-1
votes
0answers
11 views

Atmospheric correction for Sentinel 2 in ENVI [closed]

What is the best way for atmospheric correction on Sentinel 2 images with ENVI 5.3?
0
votes
1answer
31 views

Raster smoothing - assigning each raster the average value of its neighbors

I have a raster world map of population densities at a resolution of 30 arc seconds. For each raster, I want to find out the average density of neighbors within a certain distance (e.g. 0.1 degrees). ...
2
votes
1answer
44 views

WebScene: scene completely black in Chrome

We suddenly have problems visualizing ArcGIS Online WebScenes in Google Chrome (Version 76.0.3809.100 (Official Build) (64-bit)) and I am wondering if we are the only ones, as some searches returned ...
0
votes
1answer
21 views

qgis2threejs window is blank

I have used QGIS2threejs for several years in QGIS2. Now we have upgraded to QGIS3 at work and the plugin no longer works. The qgis2threejs window is blank and it displays the error “Any 3D objects ...
2
votes
1answer
41 views

Making polygon shapefile from unsorted point shapefile?

I have a point Shapefile with unsorted feature ID's (FID). I want to convert the same point file into polygon Shapefile by using python gdal/ogr. I got the help from link1 and link2. I'm able to make ...
0
votes
0answers
14 views

Changing pixel values by the average of neighbours in raster calculator?

I have a raster with values in each pixels. I need to change each pixel by the average of surrounding pixels. For example in the first row first column , the pixel value will be replaced by average ...
1
vote
1answer
20 views

Clipping a raster from quickmapservices or XYZ tiles

I'm trying to clip a google satellite XYZ tile over a layer mask of my DEM layer to make a 3D map. the problem is that after making the connection and adding it as a layer to my project, im unable to ...
0
votes
1answer
24 views

Seeking TopoJSON map of Chinese provinces which includes Hong Kong, Macau and Taiwan?

I have a TopoJSON map of China which is working well in d3.js. However, it is essential that I add Hong Kong, Macau/Macao and Taiwan to the map, but they are not included in the TopoJSON file. I have ...
1
vote
0answers
39 views

Move polygon to new location (find new lat-lng coordinates)

I need to move my polygon (region of geographical area) with 4 different (O1, O2, O3 and O4) lat-lng coordinates (as shown in the figure) to another place, so that I get new values of all 4 lat-lng ...
1
vote
1answer
27 views

PostGIS: ST_Azimuth between Points in same Table

I've seen the questions and answers about ST_Azimuth, but didn't find a specific example for this case: I need to calculate the azimuth from point id 1 to id 2, id 2 to id 3, id 3 to id 4, ... Table ...
2
votes
0answers
43 views

Saving what is inside a polygon coordinates as an image?

I am trying to get an image from inside a polygon. TLDR; What I am trying to do: save what's inside a polygon as an image. What is happening now: I am only able to save the canvas as an image. ...
1
vote
0answers
24 views

Creating a tile layer for a polygon for use in QGIS Atlas?

I want to create a series of plans at a set scale that covers a large area defined by a polygon. The polygons are a buffer for a water network, so is very irregular with sections that are long and ...
1
vote
0answers
22 views

Enable PostGIS extensions Windows local (non-admin) with Anaconda PostgreSQL

My organisation restricts admin privs on our machines, which means that installing OSGeo4Win would require a tech to come out (and as they're stretched pretty thin and I'm likely to need regular ...
1
vote
0answers
7 views

Saving a form .ui file with relative path?

My company uses QGIS 2.18 (soon to upgrade to 3.4) and I've designed a form to make data entry for our survey field staff a little less hateful. The .ui file is saved on a network drive, and as long ...
0
votes
0answers
16 views

Specifying distance units in ArcGIS Pro ModelBuilder buffer process

I'm trying to iterate on some buffer distances in ModelBuilder, and I want to be able to set the units in ModelBuilder. I have numeric (double or long) "multivalues", and I can connect the output of ...
1
vote
1answer
22 views

Transforming a GeoPackage table's geometry column into GeoJSON?

I have a GeoPackage that is downloaded to client devices for a mobile app. I need the clients to query the GeoPackage to retrieve a GeoJSON representation of the geom column. I'm familiar with ...
0
votes
0answers
13 views

Create KML or KMZ file using iOS Google Maps app

Is there a way to create a KML or KMZ file using the iOS Google Maps app? I’ve created a map on Google My Maps but can’t find a way to export it on Google Maps. I’ve tried the iOS app and the Google ...
1
vote
1answer
29 views

Projecting as USA_Contiguous_Albers_Equal_Area_Conic_USGS in QGIS?

Is it possible to project EPSG: 6350 (NAD83 (2011)) as WKID: 102039 (USA_Contiguous_Albers_Equal_Area_Conic_USGS) in QGIS? There is no EPSG code and I'm unsure how to create a custom CRS.

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