Questions tagged [geospatial]
Geospatial pertains to the geographic location and characteristics of natural or constructed features and boundaries on, above, or below the earth's surface; esp. referring to data that is geographic and spatial in nature.
120 questions
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Latitude and Longitude types
I wrote this code when reviewing Define a class for latitude and longitude in C++ using boost::units and spheroidal coordinates. As I've not used Boost::Units before, I thought it worth reviewing in ...
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What's the fastest way to get "postcodes" for thousands of coordinates (latitudes & longitudes) in Python? [closed]
I have a dataset that contains 750,000 rows. I want to query each row and get the postcodes using the latitudes and longitudes. Problem: The code is executing very fast when I query like 100 rows, and ...
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Geospatial application in python using OOP
I'm working on a tool that performs some computations using elevations from a DTM file retrieved from a WCS service. These computations will be done on predefined regions of Europe. I'm trying to ...
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1answer
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Interpolate raster value using Python
I'm new in coding. I have a shapefile (points) and some raster files. My purpose is get the values from all raster to point (each point will get value from 2 or 3 nearest cell,the value on the value ...
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1answer
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measure distance between two points in python
I'm working in a function that generates isochrones for a project of mine and I'm facing a bottleneck performing some distance calculations. Here is what I'm doing: ...
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Geohash library in C++17
GeoHash library in C++17 no allocations and no std::strings. It uses fixed buffer GeoHash::buffer_t. optimized nearby search, if possible, it search 2x2 or 2x3 ...
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Use XYZ data to create cross sectional profiles across beach terrain, using OS Grid
This might be a slightly long question, but I've recently been doing a bit of R&D on the data processing workflows within the company that I work at and it would be great to see if there are any ...
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Python library to convert spatial data or DEM (digital elevation model) to dictionary
I would like to expand a library which converts a DEM (Digital elevation model) to values stored in a dictionary. This dictionary can be used to create a 3D terrain in Three.js. I made a Django ...
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Performance optimization processing 95,000+ NetCDF files (using xarray + dask)
I was told over at gis.stackexchange.com that this question would be a better fit here. I already have a working code but it is very slow and my hunch is that it could be optimized. The goal here is ...
4votes
1answer
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find closest object via latitude and longitude and haversine distance
Given a pandas data frame containing objects with ids and latitudes and longitudes: ...
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1answer
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Vincenty's distance Direct formulae numpy
I've refactored a function from the pygc library used to generate the great_circle. The Vincenty's equation below can be found ...
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Modify polyline vertices
I have an ArcGIS Arcade script that uses JavaScript syntax. The script loops through GIS polylines and updates a coordinate. The coordinate is called an "M" coordinate (aka a "Measure-...
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1vote
1answer
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Loop through polyline vertices and update coordinate
I have a Python 2.7 script that loops through GIS polylines and updates a coordinate. The coordinate is called an "M" coordinate (aka a "Measure-value"). M coordinates are similar ...
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4votes
1answer
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Checking which polygon a set of coordinates lie inside
I have a massive set of latitude, longitude pairs. I also have a list of GeoJson formatted locations. I want to find out which location each pair of coordinates lies in. I have some code to do this, ...
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2votes
1answer
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Advice on taming a slow loop required for visualization of large GIS dataset
I'm working towards plotting a large GIS dataset of which I've shown a sample above of about 1/6 of the data. I'm happy with how quickly the data loads in, and bokeh...
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