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.
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Great-circle distance in Java
Today's assignment states that I need to write a complete java program which will calculate the relative orthodromic distance between two sets of geographic coordinates declared by the user.
When the ...
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Create map query for each unique value in column
I have a Python 3.6.8 script that does the following:
Takes the unique values in a column in a spatial table.
Creates map queries/layers for each unique value.
Each query/layer has a where clause ...
3
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1answer
118 views
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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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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Parsing Addresses with GeoPanda's GeoDataFrame
Long time reader of Code Review with my first question. I'm self-taught and suspect this code can be improved. The project is really important to me and the team and I could really use the help.
I'm ...
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code plots - spatial data
I am an absolute newcomer in R. For my bachelor thesis I worked with spatial data. I did many plots with the normal "points"-function. I already have my results, but would like to improve my code.
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Accurate && precise location data within a timeframe (session)?
Scenario
A session would start & end within a time frame. Within this time frame, the device would be moving within a constraint environment. The movement would be extremely slow (slow-walking to ...
2
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1answer
38 views
Reload polyline midpoints into parallel tables
I have an Oracle GIS database that has spatial tables. The records in the spatial tables have a geometry column that contains polylines.
I've written a Python 2.7.16 script that calculates the ...
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2answers
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Angular control for inputting latitude and longitude with validation
I've built a custom control to handle user input in a human-readable format, but save in a machine-format.
It needs to have input validation, and to convert UI-input to a base format.
I'm interested ...
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1answer
69 views
Work order spatial query (Part 2)
Part 2: Error Handling (and anything else that can be improved)
(Part 1 focused on general cleanup.)
I received this comment in an unrelated post (thanks @Milton):
...Since it is obvious you are ...
6
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1answer
129 views
Graphing refugee movements using plotly in Python
I've created a simple data visualization in python that shows the movement of refugees around the world. The code works but I feel it is a bit slow. it takes about 10 s (on my hardware at least) to ...
6
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1answer
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Work order spatial query (Part 1)
Part 1: General Cleanup
(Edit: Part 2 is here.)
I have a script in a Work Order Management System (Maximo) that performs a spatial query.
Details:
Takes the X&Y coordinates of a work order in ...
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Python program for address normalization and geocoding
This is a school project I have been working on. I have created a program utilizing Tkinter, and I was hoping to get some feedback on the way I have gone about things. I feel like it is pretty messy ...
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Converting Geographic Coordinates into Lambert2008 coordinates
This is part of a game made in Unity3D.
I wrote this class to convert geographic coordinates into lambert 2008 coordinates based on this reference document:
http://www.ngi.be/Common/Lambert2008/...
6
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1answer
148 views
Get nearest major city of an image (using EXIF GPS data)
I am writing a program that will take images in a folder, get the GPS Coordinates (from the EXIF data), then return the closest "major city".
(I define a major city as one with an airport, so ...
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1answer
570 views
Aggregate Pandas Columns on Geospacial Distance
I have a dataframe that has 3 columns, Latitude, Longitude and Median_Income. I need to get the average median income for all points within x km of the original point into a 4th column. I need to do ...
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1answer
149 views
Convert British and Irish National Grid references to or from WGS84 geodetic coordinates
I've been using this wgs84togrid program for a few years. It converts in both directions between National Grid coordinates for GB or Ireland (beginning with a ...
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1answer
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Analyzing distances between clusters of orders [closed]
I wrote the Python class below, which does what I want it to do, but the data structure is a mess. Was wondering if there was a better structure I could use to get the same results but with better ...
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1answer
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Python toolbox for OpenStreetMap data
Background
My project is a Python toolbox. This is my first bigger coding project and it took me quite some time to code this toolbox. I learned a lot from the start point to this day. I changed this ...
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757 views
Wrap location API in coroutines
In my app I need to query location and scan wifi periodically. To conserve power I need to change the rate dynamically, depending on the distance to the target. Also I want to wait for both ...
5
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1answer
81 views
Rate-limited geographic data lookup
I'm looking for a code review of this python I wrote - this code reads the zipcode column value from a CSV file and calls an API to retrieve lat, long, state and city info.
It works fine and gives me ...
10
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2answers
189 views
Where is the most desolate place in Colorado?
The Story
While flying a plane over the forests of Wisconsin a couple years ago, I thought to myself "If I lost an engine, I would be awfully long way from an emergency landing airport. I wonder ...
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1answer
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ProcessPoolExecutor KMZ file search
I've written a script to look for coordinates in KMZ files. I've tried to speed execution up using the ProcessPoolExecutor. I'm quite new to Python, so any recommendations are more than welcome.
<...
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1answer
55 views
Javascript class to geocode Dutch addresses
I am relatively new to javascript ES6, the code I've written is working fine. However I am curious if this would be the best approach. I am trying to write a reusable module that I can use in multiple ...
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0answers
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Function to calculate distances and nearest points between 2 GeoPandas dataframes
I have 2 geoPandas frames and want to calculate the distance and the nearest point (see functions below) from the geoSeries geometry from dataframe 1 (containing ...
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2answers
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Find SuburbName from latlong or location
I have create one class and interface for finding SuburbName based on Location or LatLong coordinates.
My interface
...
2
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1answer
131 views
Finding the nearest defibrillator exercise from CodingGames
For my first attempt at Scala I decided to solve a simple exercise on codingame.com.
Based on a string input containing the user location, the defibrillators count and a list of defibrillators ...
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2answers
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Convert geodetic coordinates to geocentric (cartesian)
I'd like to retain as much float precision as possible without having to resort to specialized libraries so I need this code to work with only standard modules.
I'm doing this in QGIS where ...
8
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2answers
500 views
Function to find user's region based on GPS coordinates
I've made an algorithm/ function to get a user's region based on their GPS coordinates. It primarily looks for big cites and counties for the region and the state for the outer region eg. orange ...
2
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0answers
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Determine the country by an IP
EDIT: I have updated the code, if you have comments about the previous version of the code, please do post them anyway.
The task is to determine the country by an IP.
Provided programme queries two ...
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0answers
85 views
KNN search by distinct category in postgis/postgres
I have a postgres table, etablissements with millions of rows, and a geom (st_point) column , spatially indexed (using gist). I'...
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0answers
75 views
Writing a table of national park data
I'm working to produce a Lookup table using the Arcpy module that contains descriptive statistics for US National Parks.
The original data, found in tbl, has 12 ...
1
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1answer
80 views
vectorize 2D gradient with spatially varying bins
The following code takes in some values ssh and solves the equations for the geostrophic motion (slide 8 here).
The main part of the code is the computation of the ...
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0answers
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Generate NDVI Rasters from USGS EarthExplorer Landsat 8
I've written the following using Python Dictionaries and Pathlib Module. I'd like to improve the first function: list_landsat_bands.
I've created a list of file patterns to match, which I then use ...
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0answers
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Log visitor info like latitude, longitude to a database
I am collecting each visitor information like ip, lat, longitude, referrer and language and save it into db, then in db I have column in table with counter that increment if user revisits the web site ...
4
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1answer
417 views
DBSCAN “region query” too slow; implement a tree?
My current DBSCAN in Python works...but its indexing is far too slow; its a linear scan:
...
7
votes
1answer
974 views
PANDAS nearest site algorithm
I have got CSVs full of property transactions in the UK from 1995 to 2017, separated by year such as "RS2015.csv". I have a 2nd CSV with a list of wind turbines in the UK. Both have coordinates in WGS ...
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3answers
1k views
Mask latitude text field
I have an input element on one of the pages. This input is supposed to take a string of digits from a user. In order to enhance UX I'd like to mask input's value at any given time. Like so:
What came ...
4
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3answers
368 views
Methods for calculating the distance between Polish postal codes
Let's consider we are a company who sells our products for other companies. In the programme the actors are an Agency (agencies of our company, we have a few in the ...
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1answer
222 views
Set time zone from cookie
Is the set_cookie variable the correct way to signal that the cookie should be set? It does not seems pythonic to me:
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1answer
37 views
Count buffered streets that intersect buffered points using PostGIS
PostgreSQL 9.5.1 with PostGIS 2.0 extension
This first section creates an intersection (clip) of the streets from another polygon (MTC15), then it buffers the intersection:
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1answer
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Get nearest driver from 2.5 millions of data using mongodb
I have created 2.5 millions drivers dummy data, in this case lets say the drivers are moving around in the city. The driver's document look like this :
...
5
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1answer
792 views
Laravel Pagination with haversine formula in it
I'm using the haversine formula to count distance from selected post-code to desired destination.
I have the following scope in ...
5
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3answers
243 views
Haversine Formula in Clojure
I implemented the Haversine formula to calculate the distance between two (latitude, longitude) coordinates.
I was wondering if it looks natural to Clojure programmers. What could be improved?
<...
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2answers
193 views
Generate new latitude and longitude in decimal
I have created simple algorithm to generate the new Location from given latitude and longitude.
...
7
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1answer
234 views
Raster processing for climate change model
I am working on a project on how climate change may affect the development of spruce budworm larvae throughout each year (historical and projected) using different climate change models and emission ...
4
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1answer
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PANDAS code for calculating distance between waypoints
I've written some python code designed to take a csv of waypoints for a series of trips, and calculate the distance of each trip by the sum of the distance between the waypoints.
An example csv might ...
