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1500 questions
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3 answers

Controlling Image Output Settings in QGIS?

I am exporting a QGIS map to an image format. I would like to have control over the output settings of the image (dpi), as currently it is only exporting the images at 96 dpi. Does anyone know if this is possible?
James S
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12 answers

Seeking open source software package for Remote Sensing?

Here are many questions with great answers about open source GIS software. I am wondering, what is the best open source software package for Remote Sensing? I would like to learn it and to use in my work. I used to work with IDRISI, and I've heard…
nadya
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9 answers

Are North Arrows Pointless?

A recent post on Cartastrophe refers to a "Worldwide Campaign to Eliminate Needless North Arrows." So when, if ever, are North arrows necessary? As an interesting aside the concept of North being up is not an arbitary one, but in the Northern…
geographika
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1 answer

Turn on QGIS Dark Mode

How do you turn on the dark mode for QGIS 3.6.1? I see where people have an option in the general settings of the Project Properties menu, but I am not seeing that option in my version.
Matt
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25
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5 answers

Find features within given coordinates and distance using MySQL

I have a MySQL table with user name, latitude and longitude of the user. I would like to get a list of users who are inside the circle or square of a given latitude and longitude with given distance. For example, my input Lat = 78.3232 and Long =…
shihab K
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4 answers

How can I generate irregular grid containing minimum n points?

Given a large (~ 1 million) sample of unevenly distributed points - is it possible to generate irregular grid (in size, but could also be irregular in shape if that is possible?) that will contain specified minimum amount of n points? It is of less…
radek
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15 answers

What are your biggest challenges as a GIS developer?

What are your biggest challenges when developing GIS software? Is it coding? Is it understanding cartography/geography/etc concepts (like projections)? Or other difficulties?
George Silva
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25
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1 answer

How to create a hole in a polygon in QGIS?

I'm trying to use the tool "delete ring" in order to create a hole in a polygon. The geometry of the hole is another feature of the same shapefile I cannot manage to delete the part of the polygone. Does someone have a tutorial or some explanation?
Lucien
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25
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10 answers

Installing QGIS on Ubuntu

Has anyone had any luck with getting QGIS working on Ubuntu 12.04? I have tried the stable and unstable versions and with not luck. I also get the following: "Some packages could not be installed. This may mean that you have requested an impossible…
LandArch
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2 answers

Mosaicking Image Collection by Date (day) in Google Earth Engine

I have an image collection of Sentinel-1 data over 3 years filtered by a region of interest that spans 3-4 tiles, and want to know the best way to mosaic all the images (tiles) that were taken on the same day into one image. Currently filtering by…
deepsky
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3 answers

Counting consecutive pixel values for set of rasters using ArcGIS Spatial Analyst?

I'm using ArcGIS 10 with Spatial Analyst. I have a set of rasters (8 in total) that only every contain a 1 or a 0 for each cell. Each raster represents a different years worth of data. For arguments sake year 1 to year 8. I can add all the rasters…
Hornbydd
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25
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5 answers

Creating equidistant points in QGIS?

I am trying to create points (new layer) at specific distance along the road (existing layer) in QGIS. Creating Regular points every meter at county level using ArcGIS Desktop? gives solution for ArcGIS. How to achieve this in QGIS? Adding points…
Stat-R
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2 answers

Why does my rainbow airplane stripes appearing on Sentinel 2 image?

I have downloaded a Sentinel-2 scene and there are some interesting rainbow like stripes trailing an airplane. This is an rgb image but the stripes are also visible on the other bands. You can tell it is an airplane stripe because there is a very…
PythonStudent
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1 answer

Is it ok to group by geometry in PostGIS?

Is it OK to group by geometry? We do a lot of counting points by polygon geometries, which involves intersecting the data first in order to count instances of students. by school boundary, block group, etc: SELECT n.nbhd_id , count(*) AS…
DPSSpatial_BoycottingGISSE
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2 answers

What is this GIS Principle Called?

I've forgotten the name of a particular GIS principle and need a refresher... Scenario: Let's assume there is some polygon which represents some administrative area. Let's say it's a square, for the sake of simplicity. Let's also assume there are 9…
Fezter
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