All Questions

2
votes
1answer
17 views

Mapbox - Icon rotations in FeatureCollection

I'm displaying various ships on a map and I have made real sized polygons to represent them. These are not visible at lower zooms, so I wanted to also add icons representing each ship. The icon is a ...
1
vote
1answer
42 views

What is the difference between geopackage and shapefiles? [on hold]

I'm trying to figure out what Geopackages are and often I read "it's like a shapefile but not quite." Sometimes I also read that it's the equivalent to the ESRI Geodatabase. What is the actual ...
1
vote
1answer
35 views

Using QGIS Table Manager?

in QGIS 2.18 I used the table manager plugin for renaming or removing columns in a table. This plugin doesn´t exist in QGIS 3.4.1. Is there any other plugin or way to rename, remove or order columns ...
0
votes
2answers
34 views

Converting raster pixels to vector cells?

Is there any way to convert raster pixels to vector cells? I mean each pixel to a polygon. I tried the SAGA tool 'Raster values to points' by choosing cells option instead of nodes option. As a ...
1
vote
0answers
16 views

Inserting fake data in ArcGIS database automatically? [on hold]

I am making a demo database for property search web app. I want to insert fake names (Ethiopian names), geographical location, and other user information. How can I populate the fields with fake ...
3
votes
1answer
34 views

QGIS print composer - Legend columns not aligning when title is deleted

I want a simple legend without a title and with 2 items side by side. I can't find an option to turn the legend off so have just deleted text from the Legend title box. I select Columns (2) - Equal ...
2
votes
1answer
75 views

Equal values attribute table

I don't know how to filter the attribute table in qgis. I have 2 columns, DN and DN_1, both with values from Corine Land Cover (111,112, 223, etc). I try to select the rows that have the same value. ...
1
vote
0answers
21 views

GeoServer S3 Support for GeoTIFF REST-API

I am stuck with S3 Support for GeoTIFF while I add a dataset with the REST-API. I did not find any documentation for the REST-API... so I tried to edit my local API-POST-Call: <coverageStore> ...
0
votes
0answers
23 views

Moving .pdf as a raster freely without referencing

If I import a .pdf as a new raster layer, but the referencing is off. Is there a tool in QGIS to grab and hold on to the pdf so i can move it freely to my desired location without having to worry ...
1
vote
1answer
32 views

Exporting query to identify the exact points that fall into a polygon using ArcGIS

I am using ArcGIS 10.6.1. I have a shapefile consisting of points (facilities names and adresses). I also a shapefile consisting of polygons made up of enumeration areas as well as the Local ...
1
vote
0answers
47 views

Reporting distances to polygon features along river network using QGIS?

I am using QGIS 3.6 on windows 10. I am trying to work out a way of reporting on the distances to polygon features (ecological sites) located along a river network. I have extracted the shortest path ...
2
votes
0answers
30 views

“slyr-master” plugin for QGIS doesn't work due to “missing meta data”

I downloaded the "slyr" plugin from GitHub which should be able to convert .style data into QGIS. According to the README file, I'm just supposed to add the "slyr" folder to the Python -> Plugin ...
0
votes
0answers
24 views

Calculating Cell in ArcGIS Desktop? [on hold]

How to calculate the percentage value of a single cell in a attribute table based on multiple values ​​of columns and cells in the same table?
0
votes
0answers
18 views

Distance calculation from line to multiple points in ArcGIS

I have road maps (line features) and point features representing forest plots. I created buffer around the roads. Now I want to know the distance from line(road) to the points within this buffer. How ...
-1
votes
0answers
30 views

Producing georeferenced raster to open in Google Earth? [on hold]

I'm new to QGIS. How do I georeference a cadastral image from PDF or TIFF, and open it already positioned in Google Earth?
0
votes
0answers
29 views

White boxes instead of tiles on Map

I am trying to solve this problem for quite sometime without any luck. When I minimize the browser after the map is loaded some part of the tiles goes missing and instead I see white space. There are ...
3
votes
0answers
28 views

Set page origin in QGIS Print Composer OR ArcMap Layout

Working on QGIS 3.6.1 I am reproducing an ArcMap Layout in Print Composer. This is basically pretty straightforward, but I need to recalculate the y-position of each map element, because in QGIS Print ...
0
votes
0answers
12 views

ESRI default table format

I used the "Extract values to table" tool in ArcMap 10.6. However I didn't specified the output file format. When I go to the folder where the file is saved I cannot see the file. But when I navigate ...
0
votes
1answer
23 views

Changing Opacity of Vector layer in Google Earth Engine

While importing a Shp file in Earth Engine, I want to control or change opacity/transparency of the layer. I have gone through almost all read me files, I find nothing. This doesn't work: Map....
1
vote
0answers
25 views

Getting 10 days period, max NDSI from MODIS/Terra 500m resolution daily product(MOD09GA)?

I want to make a NDSI with a ten days period from daily MOD09GA with Google Earth Engine. The code is a adaptation from this code from Nicholas Clinton at Maximum ndvi for 3 months average in Google ...
5
votes
0answers
57 views

Intersections in linestrings using PostGIS

I need to get the intersections of streets and create a graph, so to get the intersections I use this select: SELECT ST_geometrytype(geom), geom from (SELECT a.gid, st_intersection(a.geom, b.geom) as ...
8
votes
2answers
57 views

Using DEM to find permanently shadowed craters

I'm using ArcGIS Pro to try to identify permanently shadowed craters on the North Pole of the Moon. Pictured below is a screenshot of the DEM I'm using which was collected from the laser altimeter on ...
2
votes
0answers
19 views

Earth Engine import record, why?

When I paste the following on EE online code editor then if offers me the option to convert to an import record. var l8sr = ee.ImageCollection("LANDSAT/LC08/C01/T1_SR"); var roi = /* color: #d63000 */...
2
votes
0answers
27 views

EarthEngine: average/reduce a raster at resolution of coarser raster?

I want to average a 30m raster at the resolution of a 1000m one. Specifically, I want to computer, for each Daymet raster cell, the percentage of cultivated land from the 30m CDL. How can I do that ...
1
vote
1answer
24 views

Where does 'system:time_start' come from?

From EE resources [1,2] I see references to system:time_start like: // This field contains UNIX time in milliseconds. var timeField = 'system:time_start'; I guess that's used to register the start ...
0
votes
1answer
23 views

ERROR 000732: Output Location: Dataset results does not exist or is not supported?

I'm trying to use MosaicToNewRaster but a lot of errors are appears. One of them is: ERROR 000732: Output Location: Dataset results does not exist or is not supported My code is: import ...
1
vote
0answers
37 views

Reprojection puzzle

Initially, my question was about strange results in area calculations in QGIS. I got bigger results for planimetric calculations - using area($geometry) - compared to ellipsoidal calculations - using $...
1
vote
0answers
23 views

Adding Raster Layer to CURRENT Map in ArcPy of ArcGIS Pro?

I am updating some ArcGIS toolboxes that contain python scripts to ArcGIS Pro. In many of them, I add the geoprocessing results to the map and symbolizes the layer for future processing (these are ...
1
vote
0answers
18 views

Error installing visibility analysis plugin

When I try to download and install the latest version of the visibility analysis plugin from both https://plugins.qgis.org/plugins/ViewshedAnalysis/ and http://www.zoran-cuckovic.from.hr/QGIS-...
0
votes
0answers
20 views

Learning resources for Enterpise GIS with FOSS? [on hold]

I am looking for some online resources to learn enterprise GIS with open source tools i.e. equivalent of ESRI enterprise geodatabase, sde and versioning concept. I am looking for some online trainings,...
-1
votes
0answers
39 views

Current Tips for Developing Plugins [on hold]

I was taking a look at PyQGIS cookbook, but I'm struggling too much to set up the development environment. Can't understand how to make the remote debugger to work with Eclipse. I wonder how are you ...
1
vote
2answers
34 views

MySQL, geoPHP, select sites near the current site

I'm working with archaeological sites, stored as polygons in a MariaDB 10.3 table, and I have PHP 7.2 with GEOS and geoPHP available. I'm creating a page that displays all the related information for ...
0
votes
0answers
14 views

Cannot hide layers in QField

When I press a layer name and select "hide layer" in QField nothing happens, the layer won't hide. I've had experienced it with some layers but not with others. Then I am lost.
1
vote
2answers
44 views

Selecting highest value within group using QGIS?

I have a .shp of points. This points are organized in groups with same ID (group 1, 2 ,3) Each group has 10 points. Each point has a Z column with Z values. I want to select the point with the ...
1
vote
0answers
20 views

QGIS Authentication

I have been doing some reading regarding QGIS authentication. Like most of the threads I have read, I am getting a barrage of authentication requests when someone opens someone else's QGIS project ...
1
vote
0answers
20 views

Interpolating sea level data using ArcGIS Desktop?

I have monthly sea level data obtained from PSMSL in the form of excel sheet for the region Chennai. I want to interpolate the data in ArcGIS Desktop. The shapefile of the region has Polygons and I ...
2
votes
1answer
21 views

I have the following multilinestring, and I am looking for finding the intersection between each pair

I have a pair of lines, which I like to find the intersect of each of one them with each other. I know for two lines I can do the following: from shapely.geometry import LineString line1 = ...
0
votes
0answers
22 views

Mapbox/Leaflet - how to generate evenly spaced coordinates inside a polygon

I'm trying to generate an evenly spaced grid of coordinates inside a polygon. I know that I can generate random points like follows: const polygon = L.polygon([somePoints]).addTo(map); const bounds = ...
2
votes
1answer
36 views

earthEngine expression and ternary operator: why does evaluate false value when always true?

Why does EE `.expression('A?B:C') take into account C if A is always true? I am using conditional operations with the image.expression('condition ? true_action : false_action) as documented here. My ...
3
votes
1answer
28 views

Creating custom CRS from existing CRS EPSG:22780?

I am currently trying to figure out how to create a custom CRS in QGIS based on Deir ez Zor / Levant Stereographic (EPSG:22780). For this I am working with a map which shows both the EPSG:22780 ...
1
vote
0answers
27 views

How to convert 32-bit raster to double precision?

I have a raster that is currently 32-bit float, but need to convert it to a data type of Double Precision in order for it hold larger values within each cell (I'm doing some calculations). How can ...
0
votes
0answers
13 views

Clipping features with the attributes of another feature

I have a vector polygon for a catchment which contains numerous subbasins. In addition, I also, possess another vector polygon showing the impervious areas of the catchment. What I want to do is ...
1
vote
1answer
27 views

How to aggregate other columns when ST_ClusterIntersecting function is used

As stated in the PostGIS documentation ST_ClusterIntersecting is an aggregate function that returns an array of GeometryCollections, where each GeometryCollection represents an interconnected ...
1
vote
0answers
18 views

Surface Temperature + Air Temperature in Landsat image comparisons

Quick question about relating Landsat Surface Temperature to locally recorded Air Temperature on a given day: Are differences in local air temperature captured by the Landsat ARD ST imaging process? ...
0
votes
0answers
11 views

How to plot elevation charts from a GPX file that has elevation data

Is there a service or package that converts a GPX file into an elevation chart? I need either a CLI, a Web API, or a library/other software that could be wrapped up as a small service. The GPX ...
2
votes
1answer
23 views

geopandas.intersects() over each row

In trying to answer this question I ran into problems with geopandas.GeoSeries intersects methods. I have the following line and polygon: import pandas as pd import geopandas import pickle line = ...
0
votes
0answers
15 views

Raster layer not clipping to polygon boundary and yielding block extent in ArcMap?

I am using ArcMap. I want to graphically display my NDVI distribution, but I had to convert my NDVI raster layer from continuous values to integer in order to view the attribute table (I used the ...
1
vote
1answer
39 views

Creating boundaries from points and area measurements

I have a list of villages and the area measurement for each village. Is there a way to draw hypothetical boundaries of each village based on the area measurements and the calculation is able to ...
1
vote
1answer
19 views

Replacing Feature Class OR Deleting Feature Class within GDB using FME?

I'm looking to use FME to either replace/overwrite a Feature Class, or just a to delete a feature class so I can 'write' the new one into that gdb. Essentially I have constant new data being updated ...
1
vote
0answers
15 views

gdal_merge novalue

I managed to run gdal_merge for multiple geotiles (jpeg). I am using the following options: command = "gdal_merge.py -init 0 -a_nodata 0 -co COMPRESS=LZW -co BIGTIFF=YES -o "+out_bez+" -of gtiff " +...

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