All Questions

0
votes
0answers
2 views

Resampling Sentinel-1 to Landsat 8 size and location

I am training a convolutional neural network to classify landcover and I would like to ingest both Landsat 8 and Sentinel-1 into my classifier. Currently it is working reasonably well for Landsat 8 ...
0
votes
1answer
5 views

Blown out TIFF image after merge in QGIS?

I'm attempting to merge four GeoTIFF images in QGIS for the first time and am getting unexpected results. Navigating to Raster --> Miscellaneous --> Merge..., I set up the merge as follows: Once the ...
0
votes
0answers
4 views

Convert raster symbology to vector shapefiles

I have a satellite raster geoTIFF, the image shows a coastal region with water, rocks, grass. To display these three features of interest, I've symbolised the raster via a classified style using 3 ...
0
votes
0answers
2 views

Why does fasterize gives different output for multipolygons with and without internally resolved boundaries?

I was thrilled to be clued into the package fasterize, which speeds up the rasterization process in R tremendously. However, I cannot for the life of me figure out why the function outputs two ...
0
votes
0answers
9 views

Cannot convert 'nan' to double, QGIS Field Calculator

I have about 1,6 million lines I need to get the bearings of (0-360). When running below code in Field Calculator, I get error after a few seconds "An error occurred while evaluating the calculation ...
1
vote
0answers
13 views

Hanged while Executing function if Connection to Internet is Lost

I am trying to update feature layer. I am updating the records in a loop. The problem is in the case Internet connection lost. It get stuck in the edit_features() function. I have to ctrl+c to stop ...
0
votes
0answers
7 views

change color of rubberbands used when Vertex tool is active

When using the Vertex Tool, I see a rubberband. I'm actually hoping these are 2 rubberbands in reality, because I would like to color each one based on their length using Python. Is it possible to ...
0
votes
0answers
5 views

How do I make a selection to get the desired layers by attribute?

There is a web map downloaded from ArcGIS Online. How do I make a selection to get the desired layers by attribute? for example, floor = 3 Portal portal = new Portal("http://www.arcgis.com"); ...
-1
votes
0answers
6 views

Extracting location from tweets whose location or x y coordinate is not available [on hold]

I am trying to retrieve location from tweet text whose location of the user is turned off how do i go about it??
0
votes
0answers
9 views

Install SWAT hydrological model on UBUNTU

I am trying to go back using ubuntu in my work as hydrologist. Is there any way to install the SWAT model, and in particular QSWAT on ubuntu? Best Giulio
0
votes
0answers
6 views

Using population data as Z-axis to make a 3D map in Python

I want to make a 3D thematic map with the different status' population data as the height in Python. Now I have the shapefile of the status and the population data. But I don't know how to link the ...
2
votes
1answer
50 views

latest version of QGIS fails to edit attribute table of GeoJSON file

I am using QGIS 3.6.4 and working with GeoJSON files. I have come across a very annoying problem. Whenever I try to add an attribute and assign values to it using the field calculator, the values will ...
0
votes
0answers
8 views

Seeking C# code to convert Easting/Northing to latitude/longitude in GDA94 / MGA zone 56? [on hold]

I am very new to GIS. I'm pulling data from an ArcGIS Rest API service for a city in Australia to display as pins on a map in another system. The data I'm getting back has all the actual coordinates ...
0
votes
0answers
10 views

Vector Layer | Shape Source not showing on map canvas

I am trying to open a shapefile in the QGIS 3.4.4 version but for some reason the layer is not showing in the map canvas. I have tried the drag and drop approach as well as opening from Layer -> ...
0
votes
0answers
8 views

Basemap and EPSG 3857

I have my MatPlotLib basemap set up in Mercator projection: map = Basemap(projection='merc', llcrnrlon=-10., llcrnrlat=30., urcrnrlon=36.5, urcrnrlat=46.) I need to create an ...
0
votes
0answers
10 views

Spatial joining (nearest) between features that fulfill query? [on hold]

I have two point feature classes, one with locations wildfires were discovered, and one where lightning strikes were detected. Both feature classes contain temporal information. For each fire, I want ...
-3
votes
0answers
6 views

Seeking OCM chlorophyll data?

I need OCM chorophyll data for my project purpose. But bhuvan portal has been stopped providing that data. Where can I obtain that data? I even asked NRSC for data long but they have not replied.
0
votes
0answers
10 views

How can i use cgal in Python?

I have a project which needs some of cgal features. How can I use cgal library in Python? i tried installing cgal-bindings but is comes up with this error: Complete output from command python setup....
0
votes
0answers
3 views

T55 of Geohms; no automatic computation

I hope somebody is inclined with Tr55 in Arcgeohms extension; Please help me friends; how to calculated length from the end of Longest flow path to AA then BB; Myarcgis dont automatically accountr for ...
-3
votes
0answers
20 views

CHANGE OF GPS FIRMWARE GEOEXPLORER TRIMBLE

Is it possible to install the firmware of a gps of another brand, the Geoxplorer XH 2005 of Trimble? Informative note: the Geoxplorer XH 2005 has Windows Mobile Operating System 5.1
0
votes
1answer
17 views

ArcGIS 10.6 ArcPython Update Cursor Not Populating Field

I recognize similar questions have been asked but I have yet to see what my code is lacking in any of their answers. I am trying to use the code below to periodically update attributes in a Feature ...
0
votes
1answer
15 views

Transform geometry of polygons

I am new to PostGIS. I'm making a spatial join, but it does not work. From what I saw it is something of the geometry of polygons. My polygons are saved with the "Geom" field like this (Geom geometry (...
0
votes
1answer
16 views

Minimum Bounding Geometry Convex Hull

I have 1000+ irregular shaped polygons where I would like to determine the orientation (azimuth) of their long axis. The polygons overlap in a few cases, if that matters. I am using the Minimum ...
0
votes
0answers
19 views

My work closed and now I cannot see the Temporary Scratch Layers [duplicate]

This is my first project on QGIS 3.6.1. Over night my computer restarted and updated itself closing my QGIS work.. I created two separate Temporary Scratch Layers and frequently saved it on my ...
0
votes
1answer
9 views

Counting (Multi)Polygons Within (Multi)Polygons on same Table

So I have a table with approximately 10k rows, with each row having its corresponding geometry entry. What I am attempting to do is count how many row geometries are contained/within the geometry of a ...
0
votes
0answers
22 views

Identifying flat-ish hilltops in a DEM?

I am working on a project where I need to identify the area of a hilltop that is relatively flat within which stone structures could be built before the slope becomes too great to build without having ...
0
votes
0answers
6 views

The Spyder in Anaconda runs Python scripts slowly [on hold]

I have a question about how fast of Spyder running a python scripts. I have 36 scenarios and 80 points in each scenario. At the very beginning, it takes me about 20 minutes to finish one scenario. ...
0
votes
0answers
12 views

OpenLayers Plugin Issue

I get this error when pulling a map from the OpenLayers Plugin. See Below. An error has occurred while executing Python code: AttributeError: 'OpenlayersLayer' object has no attribute '...
0
votes
1answer
16 views

Mapbox Vector Tiles appear to lack accurate intersection nodes?

Mapbox Vector Tiles appear to lack accurate intersection nodes. Is this a bug? i.e. should the tile's geojson include a shared node between two intersecting streets? Details: Using MVT's from http:...
1
vote
1answer
35 views

Printing attributes of selection in ArcPy?

I'm trying to use ArcPy to print a list of addresses of land parcels crossed by a power line. I'm using the following code to accomplish this: # Loop through features in parcels.shp for feature in ...
0
votes
1answer
15 views

Labeling Graduated Symbols in ArcMap?

I am looking to place labels showing the exact number associated with a graduated symbol. I have the labels, and the symbols, but cannot seem to get them placed in the same location. Can someone shed ...
-1
votes
0answers
15 views

indendation error after typing code in the QGIS python console [on hold]

I just started to study the python console in QGIS and follow a tutorial. Unfortunately, the code I copied doesn't work and I have no idea why. Can somewhat explain it to me. layer = iface....
-1
votes
1answer
35 views

NameError: global name 'layer' is not defined

I've modified code of a plugin go2nextfeature as below import os from collections import OrderedDict from geo_utils import utils as geo_utils, vector_utils as vutils from qgis.core import * from ...
3
votes
1answer
59 views

Simplify multiple lines: create central axis?

I have a layer with railway lines, downloaded from OpenStreetMap. Every single track is represented separately, so at trainstations, you have several parallel lines, as well as sidelines that lead to ...
0
votes
0answers
16 views

Printing satellite imagery from ArcGIS Server using QGIS 3

I am using QGIS 3.6.1 I made a map (my first one ever) that includes satellite imagery that I obtained from the ArcGIS Server. The map looks perfect in the Layout, but when I save to a file (PDF, ...
0
votes
0answers
12 views

Get set of 250x250 pixel tiles from an image

I am trying to split the Hansen dataset https://developers.google.com/earth-engine/datasets/catalog/UMD_hansen_global_forest_change_2018_v1_6?hl=fr into 250x250 pixel tiles within a region. For that ...
1
vote
0answers
21 views

Python Stand Alone Script Parsing error SyntaxError: invalid syntax (line 1)

I'm pretty new to python, but I'm trying to transpose a time field for a set of data I'm working with in ArcMap. I changed the file locations and fields to my needs. However, when I try to run the ...
0
votes
0answers
9 views

Difference between a GNSS receiver and GNSS antenna [on hold]

I´m relative new using GNSS data and I would like to understand a little more about the instruments that I´m planning to use in my future research. I was looking information on the UNAVCO website ...
0
votes
0answers
20 views

How to set masked pixel value in Earth Engine image export

I'm using Earth Engine to preprocess and download some NDVI data. I used a region of interest to clip the imagery to a geometry, and values from the Summary QA layer to mask out pixels that were of ...
0
votes
0answers
9 views

Eliminating superfluous raster values using ArcMap?

I have used the raster calculator in ArcMap to calculate the salinity index (RED-NIR/RED+NIR Khan et al.) over a portion of land which was disturbed by the construction of a solar farm. Landsat 8 ...
0
votes
0answers
13 views

Adding date to property of images using Google Earth Engine? [on hold]

I mosaic images in different area. However I lost the time which is really essential to my study.
0
votes
0answers
20 views

Using list of attributes to create layers?

I have a very long list of values (over 2000 rows) in the following format: 1: TAY100, AB60, EM10 2: CA40, 9, UT26, 24 3: YO56, YE I have a layer with features each with a distinct attribute called ...
1
vote
0answers
18 views

Finding Raster Pixel Neighbors using GDAL?

I'm new to GDAL Python, and I'm working on a little recursive algorithm which requires finding the neighbors of a a pixel on a DEM raster. I've been able to do this by creating a little PixelLite ...
1
vote
0answers
20 views

Labeling when using qgis2web

I'm having trouble getting labels to appear in a web map, both Leaflet and OpenLayers, using qgis2web. I can't get either label buffers or backgrounds to show up and even a Bold style only works in ...
0
votes
0answers
12 views

How do I crop a TIFF down to a specific region?

I have two TIFFs that have the same pixel size. One of them is geolocated inside the other. I would like to crop the larger one down to the exact same extent as the smaller one. Is this possible with ...
0
votes
0answers
6 views

self.iface.mapCanvas().destinationCrs() Replacement in QGIS 3

I need to store the map canvas' destinationCrs in a variable, but when using the following line: self.iface.mapCanvas().destinationCrs() I get the error: 'QgsMapCanvas' object has no attribute '...
0
votes
0answers
9 views

Calculate canopy openness using RGB mosaic from UAV orthorectified aerial images

Canopy openness of trees was obtained easily from digital photographs processed with Gap Light Analyzer. Image processing involves the transformation of image by the division of pixel intensities into ...
2
votes
2answers
22 views

View attribute (/field) names of a geopackage table without opening the whole file

I have a large geopackage file (15gb) for which I'd like to see the attribute (/field/column) names. Is this possible without loading the whole file? Edit: It would be ideal if there was a command ...
0
votes
1answer
20 views

Seeking CSMapMaker (QGIS Plugin) equivalent for ArcGIS Desktop?

I'm looking for a tool or script or set of operations to mimic the output from a certain QGIS plugin called CSMapMaker, wherein curvature, slope, and a gaussian filtered DEM are overlain one another ...
0
votes
0answers
13 views

RGB image file to Y'CbCr and other Luma+Chroma Representations

is it possible using QGIS on windows to convert an RGB image file to Y'CbCr and other Luma+Chroma Representations format. I've seen various formulas for this written in MATLAB and R. I am looking to ...

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