All Questions

0
votes
0answers
16 views

Discrete Global Grid Systems (DGGS) : [on hold]

As part of a specification work on Global Grid Systems Discrete (DGGS) https://en.wikipedia.org/wiki/Discrete_Global_Grid One of our questions is follow : In some cases, would a grid consisting of ...
1
vote
1answer
39 views

Matching Project CRS to Layer CRS in QGIS

I'm working with QGIS (2.18.13) and I have a vector layer made up of many polygons (CRS: WGS84/29N) but need to change project CRS to match this in order to extract correct area data. Project CRS = ...
-1
votes
0answers
22 views

Graphing and coloring parts of map with precipitation data and include legend?

I need to graph rain data from OpenWeatherMap. I also need to shade in a red color with an opacity of 0.3, on top of the prcipitation layer. This is the code I have, but it gives me an error, that ...
-2
votes
0answers
15 views

Sentinel2 classification in R [duplicate]

After preprocessing of Sentinel 2 imagery, now I have Level 2 of Sentinel 2 which has 10 bands. I want to run classification of this imagery in R. However, I have never learned R. So could you please ...
1
vote
1answer
27 views

Obtain monthly and yearly average values of EVI using MODIS data on Google Earth Engine

I am currently trying to export and obtain rasters of EVI for: Every month of the year across 2000 to 2018 ie. If January has two MODIS EVI images, I would like to take the mean of the images for ...
2
votes
1answer
25 views

QGIS general character encoding

This isn't a particularly major issue, but I've had this thing nagging me for a while. When looking at QGIS 3.4's global variables, user_full_name is assigned my given and surname, which includes a ...
0
votes
0answers
5 views

Removing placemark in KML exported from MapMyWalk

I created a route in MapMyWalk, saved it with distance markers turned off. When I export the file to .kml and open in Google Earth, a placemark and label for every one of the 220 miles appears. I ...
2
votes
0answers
9 views

Using Plugin > Map Creator > Set Layer CRS

I am using map creator and I would like to permanently set the layer CRS value. I place multiple maps within one project on QGIS, and I have to manually set the CRS value each time a new layer is ...
0
votes
0answers
15 views

Earth Engine how to avoid timeout for buffer calculation?

I have a function that takes a feature and creates a buffer around it. createBuffer = function(feature){ var AOI = feature.geometry().buffer(3000); return ee.Feature(AOI).copyProperties(feature)...
0
votes
1answer
20 views

Seeking code sample or pointer showing how to calculate Corner Coordinates of JPG file based on EXIF GPS data? [on hold]

This is a follow up to this question: Using GDAL to extract Corner Coordinates based on a jpg file's GPS EXIF data? Per the answer I received to the above question, gdal_merge cannot merge JPG ...
0
votes
0answers
9 views

TypeError: can't multiply sequence by non-int of type 'numpy.float64' [on hold]

def function_to_fit(x, a, b): return (a*x) + b fit_guess = np.array([ 2., 0.]) popt, pcov = curve_fit(function_to_fit, x, y, sigma=y_err, p0=fit_guess) print("Fit Parameters:", popt) print("Fit ...
1
vote
1answer
145 views

Invalid geometry vs. no geometry

Looking at the QGIS API Documentation: bool QgsFeature::hasGeometry Returns true if the feature has an associated geometry. Is invalid geometry different from a feature having no associated ...
0
votes
0answers
16 views

Seeking Tools for Splitting Line Strings to use with Parcel Fabric and Python?

I have only been working with parcel fabric for a little over a month now. So far I am cleaning up overlaps, but line strings get in the way. As I fix line strings, particularly with road right of ...
2
votes
0answers
22 views

Detecting QGIS file lock

I tried using rgdal::writeOGR in R to overwrite a SHP file that was open in QGIS. Error in writeOGR(x, "C:/myFiles", "testFile", : Creation of output file failed Not only did it fail to ...
2
votes
1answer
32 views

Calculate mean values for all bands and date to a dataframe

I have 5 rasters, each having 10 bands, where each band corresponds to a specific date. How do I calculate mean values for all 10 bands and save them? I need to save the mean values in a dataframe ...
0
votes
0answers
20 views

How to use httr R package to query thematic polygons from api.ohsome.org?

OpenStreetMap (OSM) nodes and ways provide key value pairs, for instance: key:landuse and value:vineyard. How to query the latest polygons (ways) of Toulouse from api.ohsome.org that contain the key ...
2
votes
3answers
79 views

Why is there a transformation shift/distortion of ~1.5km in OpenLayers 5.3.0 going from EPSG:4326 to EPSG:3857?

I have two features in plain WKT format, the source coordinates being in standard EPSG:4326 projection. I use these features to run some intersection operations, and I'm troubled by the fact that in ...
0
votes
1answer
27 views

Using JavaScript to manipulate the display of GeoJSON on Openlayer4

I am loading a number of geojson data (all polygons) and using 3 sliders, the user should be able to get a polygon displayed based on the slide value. Here is an online example of what I intend to ...
1
vote
2answers
33 views

Sort by multiple fields and delete record with highest value

I have some GPS points that I am trying to find the highest precision point for. How would I go about sorting the table by time collected and horizontal precision and then deleting the highest ...
2
votes
2answers
17 views

Problem downloading and using NOAA CCAP data

I am trying to download CCAP land cover data and would have expected .img or .tiff files, but the data downloads as a disk image file. I cannot figure out how to access/work with this file type. any ...
0
votes
0answers
4 views

Suitable Image or container that has ST_MakeValid functionality

I'm looking for an easy to deploy machine image that would allow me to use the ST_MakeValid function. I'm looking to use this in an ogr2ogr call, but can't get a version compiled correctly against ...
-2
votes
1answer
40 views

Can I use PostgreSQL as a database with ArcGIS Pro? [on hold]

I've been with my current job for 2 years now and have been using QGIS with PostgreSQL. We are currently testing ArcGIS Pro noticed that I can connect to my PostgreSQL database that I was using on ...
2
votes
2answers
35 views

Tool in QGIS to construct polygons based on network of lines

Is there a tool in QGIS similar to "Contruct polygons" in ArcGIS that creates polygons from existing lines? This is different from convert lines to polygons that requires closed loops. Instead, I am ...
0
votes
0answers
18 views

Segmentation of a line based on several overlapping lines within the first line

I stumbled over a problem which I can't figure out myself so maybe you can help me.. I have a line going from 0 to 100% of its length. On this line I have 1:n lines with different information and ...
0
votes
0answers
9 views

How to set correct geo information on pleiades images with RPC model?

Now I have pleiades raster (img.tif) and a RPC model (rpc.XML). In the rpc.XML, there are the following lines which can be used to reset geo information. <RFM_Validity> <...
1
vote
0answers
19 views

Where have all the projected national CRSs gone in QGIS 3.4.3?

I have been working with different geographic projections in QGIS 3.4.3. I cannot find any Australian national geographic projections, such as GDA94Z55 in the new version. They were there in QGIS 3.4....
1
vote
1answer
8 views

WFS Query filter grouping “and” and “or”

I have a WFS query filtering on a property and a spatial element. Exmaple: <wfs:Query typeNames="bag:verblijfsobject" srsName="EPSG:28992"> <fes:Filter> <fes:...
0
votes
0answers
17 views

Compressing 16 bit 4 band RGBI (.img)

I have over 1000 georeferenced .img files I need to compress down for sharing. They are 16 bit 4 band RGBI, and use about 800mb of space each. I really like the result of compressing using ...
2
votes
1answer
42 views

Calculating standard metrics in multiple LiDAR files with lidR 2.0 [on hold]

I am porting my existing code to lidR version 2.0 and would like someone to let me know if I am coding efficiently. My objective is: to process a directory of LAS files normalize las files calculate ...
2
votes
0answers
16 views

Least cost path from visibility

I use ArcGIS 10.1 and I am dealing with viewshed and least cost path analysis. I would like to generate a path on the basis of a cost surface taking into account the viewshed data as indicated in the ...
0
votes
0answers
9 views

How to increase the header height for an Layout Attribute Table in QGIS 3?

I need to increase the header height because the header text has 2 lines. The only way I could find to increase it was use cell margins. But that affects all rows. How to increase the height of the ...
0
votes
0answers
20 views

Why is taking too long while trying to generate the graph for accuracy? [on hold]

I'm following https://docs.google.com/document/d/1bRCEB8ybRUp2D6vFc7mjqDMG2bpmCd2iTPQIEern0mk/edit# This is my code https://code.earthengine.google.com/6297874b379568ce2141af222c638b34 Why I keep ...
0
votes
0answers
37 views

How to drill polygons within one layer, ArcGIS 10.3

I have a one layer that has multiple polygons sitting on top of each other. Is there any tool to drill all the polygons between each other?
1
vote
1answer
18 views

How do duplicate script on Google Earth Engine code editor

I'm following https://docs.google.com/document/d/1bRCEB8ybRUp2D6vFc7mjqDMG2bpmCd2iTPQIEern0mk/edit#, its about classification and regression. I followed the regression part then I'll do the ...
0
votes
0answers
11 views

Separating snapped nodes while topological editing is active on QGIS

Is there any immediate method for separating two snapped nodes (for example at the respective ends of two separate connected lines) while topological editing is turned on. Topological editing can be ...
0
votes
1answer
18 views

Converting string to float in Calculate Value for ModelBuilder?

In ArcMap 10.2 I have created a nested model where I am iterating through some feature classes in order to get the minimum value of a specific field for each of them and then collect the outputs using ...
0
votes
1answer
21 views

Merging lines shows up as two parts in vertex list

I've merged multiple lines in ArcMap 10.5.1. When I go into the vertex list it shows up as two different parts. Why is this? I can also explode it as a multipart. Is it possible to turn it into "one" ...
0
votes
1answer
9 views

Using catalog_apply in the lidR 2.0 package, convert raster outputs to data frame format

I've moved over to version 2 of the lidR package. In previous versions, the output of producing stdmetrics using catalog_apply was a data frame. In version 2.0, the outputs are stored in raster ...
1
vote
0answers
34 views

Strange behaviour viewing world map with EPSG:4326

I'm trying to visualise/convert EPSG:3857 map tiles to EPSG:4326, but am experiencing strange behavior in that I don't think the most zoomed out view of the world is using the correct CRS/Auth ID. ...
0
votes
0answers
12 views

Selecting values with date-format by using SelectLayerByAttribute_management with input Parameter

I am working on a Tool which selects records depending on the input value. Works fine, till I want to select date-records. I used def buildWhereClause(self, table, field, value): # Add DBMS-...
4
votes
0answers
20 views

Fixing buildings that do not appear in 3D using Mapbox gl js?

I'm trying to adopt this Display buildings in 3D example, but I found out that in my city (Minsk, Belarus) some buildings look flat like this: The coordinates of this particular building are 27....
2
votes
2answers
42 views

Selecting all values with <Null> by using SelectLayerByAttribute_management with input Parameter

I am trying to select all values with Null by using the SelectLayerByAttribute_management. But the Fieldname in the where-clause is alterable by using the input-parameter. That is what i tried: if ...
1
vote
1answer
27 views

Projecting latitude/longitude coordinates to Cartesian?

Let's say I have a square whose vertices are defined by coordinates in latitude/longitude format. I want to represent this square (and which ever shapes it contains, also defined as latitude/longitude)...
1
vote
0answers
16 views

Joins & Relates in layer file Layer Properties - how does it work?

I'm using ArcMap 10.5. I set up symbology for a feature class based on joined attributes from a table in the same file geodatabase. I want to be able to apply the same set-up in different geodatabases ...
1
vote
0answers
12 views

QGIS 3.4.3 touch zoom and pan

QGIS 3.4.3 touch zoom and pan missing from Map Navigation Toolbar is this a permanent loss or will there be a fix?
3
votes
0answers
25 views

Old .qml style (vector-polygons) from Qgis 2.18 in Qgis 3.4

i have a .qml polygon style file created with Qgis 2.18. It works to import until Version 3.2 without problem. But in 3.4 the style is loaded, but not applied/visualized. The Polygons dissappear ...
3
votes
0answers
35 views

Unable to compute intersection between two polygons using PyQGIS?

I have two polygons in different layers. I am trying to find the intersect between the two polygons. Below a figure showing my test case. I initially wanted to find the intersect between the green ...
0
votes
0answers
16 views

WMS / WFS time interval of reloading / updating / refreshing (QGIS)

Is it possible in QGIS to adjust a time interval (f.e. 3 seconds) for reloading / updating / refreshing a WMS/WFS request? Or just updating the canvas with all it's layers in a given time interval?
0
votes
1answer
30 views

Using GDAL to extract Corner Coordinates based on a jpg file's GPS EXIF data?

I have ~100 jpeg images taken by a Drone. I tried to use gdal_merge to merge them and create a big tile GeoTIFF image. gdal_merge spends lots of time, and in the end, it just put each jpeg image ...
0
votes
1answer
26 views

Projecting gtiff data using GDAL and Python?

I have a tile data and I would like to transform the data to a gtiff data with georeference information via gdal and python. The tile is the quadtree tile with quad key 1321222320321122. The left ...

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