# Geo **URL:** https://discourse.julialang.org/c/domain/geo/18.md?page=5 [Latest](https://discourse.julialang.org/latest.md) · [Categories](https://discourse.julialang.org/categories.md) · [Tags](https://discourse.julialang.org/tags.md) **Page:** 6 --- ## [Lazily reading from force data cube](https://discourse.julialang.org/t/lazily-reading-from-force-data-cube/71951)
**Author:** [@maxfreu](https://discourse.julialang.org/u/maxfreu)\ **Replies:** 1\ **Last updated:** [December 13, 2021, 8:59am UTC](https://discourse.julialang.org/t/lazily-reading-from-force-data-cube/71951 "2021-12-13T08:59:40Z")
Hi! I would like to read data lazily from a force datacube. Force is a processing pipeline for satellite images and it stores the outputs into a bunch of folders. Each folder (“tile”) covers a rectangular area and conta… --- ## [Any 'getting started' docs/links for GeoJulia ecosystem?](https://discourse.julialang.org/t/any-getting-started-docs-links-for-geojulia-ecosystem/72040)
**Author:** [@byezy](https://discourse.julialang.org/u/byezy)\ **Replies:** 3\ **Last updated:** [December 6, 2021, 12:24pm UTC](https://discourse.julialang.org/t/any-getting-started-docs-links-for-geojulia-ecosystem/72040 "2021-12-06T12:24:23Z")
Looking for a ‘getting started’ entry point for using GeoJulia for basic geospatial work that ties all of the packages and their capabilities/usage together… does anything exist? --- ## [Valid GeoJSON object for choroplethmapbox Trace](https://discourse.julialang.org/t/valid-geojson-object-for-choroplethmapbox-trace/72592)
**Author:** [@Dieter](https://discourse.julialang.org/u/Dieter)\ **Replies:** 4\ **Last updated:** [December 5, 2021, 4:28pm UTC](https://discourse.julialang.org/t/valid-geojson-object-for-choroplethmapbox-trace/72592 "2021-12-05T16:28:00Z")
Hello Community! I try to create a plotly choroplethmapbox using a GeoJSON for the coordinates of the geographical regions and a dataframe containing the values which are used to color the regions. Plotly choroplethmap… --- ## [Circular array in Julia](https://discourse.julialang.org/t/circular-array-in-julia/25588)
**Author:** [@udistr](https://discourse.julialang.org/u/udistr)\ **Replies:** 27\ **Last updated:** [November 16, 2021, 12:28pm UTC](https://discourse.julialang.org/t/circular-array-in-julia/25588 "2021-11-16T12:28:02Z")
Is the a simple way in Julia to define circular array, e.g., if I have: x=zeros(4,4) I would like that: x\[1,5\] = x\[1,1\] x\[1,6\] = x\[1,2\] … and x\[5,1\] = x\[1,1\] x\[6,1\] = x\[2,1\] … I would like to define a more comp… --- ## [Polygon area on geoid](https://discourse.julialang.org/t/polygon-area-on-geoid/9107)
**Author:** [@mafla](https://discourse.julialang.org/u/mafla)\ **Replies:** 6\ **Last updated:** [November 1, 2021, 10:42pm UTC](https://discourse.julialang.org/t/polygon-area-on-geoid/9107 "2021-11-01T22:42:03Z")
Hi all, is it possible to estimate the area of a lat-lon-box with Geodesy.jl? Many thanks! --- ## [Inefficient compression of very large GeoTIFFs with ArchGDAL compared to gdal\_\* binaries](https://discourse.julialang.org/t/inefficient-compression-of-very-large-geotiffs-with-archgdal-compared-to-gdal-binaries/70687)
**Author:** [@NiclasMattsson](https://discourse.julialang.org/u/NiclasMattsson)\ **Replies:** 3\ **Last updated:** [November 1, 2021, 7:29pm UTC](https://discourse.julialang.org/t/inefficient-compression-of-very-large-geotiffs-with-archgdal-compared-to-gdal-binaries/70687 "2021-11-01T19:29:49Z")
I’m using ArchGDAL to save climate data as large 3D GeoTIFFs, but I’ve noticed that files created in ArchGDAL are roughly 3x larger than those created with gdal\_\* binaries. As a diagnostic I eliminated all my calculation… --- ## [Find if point is within geojson polygons](https://discourse.julialang.org/t/find-if-point-is-within-geojson-polygons/70416)
**Author:** [@alex-s-gardner](https://discourse.julialang.org/u/alex-s-gardner)\ **Replies:** 3\ **Last updated:** [October 26, 2021, 10:47pm UTC](https://discourse.julialang.org/t/find-if-point-is-within-geojson-polygons/70416 "2021-10-26T22:47:36Z")
I am slowly dipping my toe into the Julia waters and I’m hoping someone could point me in the right direction as to how I can determine if a point falls within any of the polygons defined by a geojson file. I’ve found Ge… --- ## [Any Julia package to compute the Standardized Precipitation Index (SPI)?](https://discourse.julialang.org/t/any-julia-package-to-compute-the-standardized-precipitation-index-spi/69286)
**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\ **Replies:** 2\ **Last updated:** [October 6, 2021, 12:33pm UTC](https://discourse.julialang.org/t/any-julia-package-to-compute-the-standardized-precipitation-index-spi/69286 "2021-10-06T12:33:26Z")
Any package in Julia to compute the Standardized Precipitation Index (SPI) ? I had a (quick) look at ClimateTools.jl but couldn’t find it there… --- ## [Porting MATLAB code that uses Mapping Toolbox](https://discourse.julialang.org/t/porting-matlab-code-that-uses-mapping-toolbox/68967)
**Author:** [@fyzycyst](https://discourse.julialang.org/u/fyzycyst)\ **Replies:** 1\ **Last updated:** [September 29, 2021, 10:27pm UTC](https://discourse.julialang.org/t/porting-matlab-code-that-uses-mapping-toolbox/68967 "2021-09-29T22:27:35Z")
Looking for opinions/options… I’ve got some old MATLAB code that makes use of Mapping Toolbox that I want to port into Julia. What’s my best bet? Thanks. --- ## [Projection from Lambert Conformal Conic to Lat/Lon](https://discourse.julialang.org/t/projection-from-lambert-conformal-conic-to-lat-lon/68629)
**Author:** [@Dieter](https://discourse.julialang.org/u/Dieter)\ **Replies:** 10\ **Last updated:** [September 23, 2021, 8:38pm UTC](https://discourse.julialang.org/t/projection-from-lambert-conformal-conic-to-lat-lon/68629 "2021-09-23T20:38:51Z")
Hello Community After taking a look at packages like ArchGDAL I have still no idea how to project coordinates from an arbitrary Lambert Conformal Conic projection, defined by standard\_parallel, latitude\_of\_projection\_or… --- ## [Moving to GeometryBasics](https://discourse.julialang.org/t/moving-to-geometrybasics/40861)
**Author:** [@arsh](https://discourse.julialang.org/u/arsh)\ **Replies:** 9\ **Last updated:** [September 2, 2021, 10:42am UTC](https://discourse.julialang.org/t/moving-to-geometrybasics/40861 "2021-09-02T10:42:12Z")
Hi all! I am Arsh Sharma, an electronics undergraduate and I am working on the geospatial ecosystem, in this year’s JSoC under the mentorship of Martijn Visser @visr, Bogumił Kamiński @bkamins and Maarten Pronk @evetion … --- ## [GeoArrays band math](https://discourse.julialang.org/t/geoarrays-band-math/65947)
**Author:** [@KrOstir](https://discourse.julialang.org/u/KrOstir)\ **Replies:** 7\ **Last updated:** [August 13, 2021, 3:15pm UTC](https://discourse.julialang.org/t/geoarrays-band-math/65947 "2021-08-13T15:15:20Z")
I am working with an GeoArray and would like to perform band maths with it, i.e. compute NDVI from bands. I am currently doing the following: # Read Sentinel-2 data fn = download("https://bitbucket.org/earthobservation/… --- ## [Geodesy: how to calculate the straight line distance between two locations, which is represented by longitude and latitude?](https://discourse.julialang.org/t/geodesy-how-to-calculate-the-straight-line-distance-between-two-locations-which-is-represented-by-longitude-and-latitude/19984)
**Author:** [@bsnyh](https://discourse.julialang.org/u/bsnyh)\ **Replies:** 29\ **Last updated:** [June 20, 2021, 10:00pm UTC](https://discourse.julialang.org/t/geodesy-how-to-calculate-the-straight-line-distance-between-two-locations-which-is-represented-by-longitude-and-latitude/19984 "2021-06-20T22:00:16Z")
Is the following the correct way to calculate the straight line distance between two points / locations by longitude and latitude? julia\> using Geodesy INFO: Precompiling module Geodesy. julia\> x\_lla = LLA(-27.468937, … --- ## [Plotting data on a map in Julia](https://discourse.julialang.org/t/plotting-data-on-a-map-in-julia/4655)
**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\ **Replies:** 8\ **Last updated:** [June 10, 2021, 2:45pm UTC](https://discourse.julialang.org/t/plotting-data-on-a-map-in-julia/4655 "2021-06-10T14:45:40Z")
Is there any way to plot data with latitude/longitude on a map in Julia? I am used to folium in Python and ggmap in R: https://github.com/python-visualization/folium https://github.com/dkahle/ggmap but I am trying to… --- ## [Workflow for flotting GPS data over map background](https://discourse.julialang.org/t/workflow-for-flotting-gps-data-over-map-background/62522)
**Author:** [@HugoTrentesaux](https://discourse.julialang.org/u/HugoTrentesaux)\ **Replies:** 22\ **Last updated:** [June 7, 2021, 5:11pm UTC](https://discourse.julialang.org/t/workflow-for-flotting-gps-data-over-map-background/62522 "2021-06-07T17:11:07Z")
The workflow for plotting GPS data over a map background with a given projection is pretty common. However, I did not find any tutorial or documentation about it. https://juliageo.org/ mentions many packages to deal with… --- ## [Compute surfaces of intersection between circles in julia with LibGEOS](https://discourse.julialang.org/t/compute-surfaces-of-intersection-between-circles-in-julia-with-libgeos/59811)
**Author:** [@Meije\_Gawinowski](https://discourse.julialang.org/u/Meije_Gawinowski)\ **Replies:** 4\ **Last updated:** [April 24, 2021, 12:55pm UTC](https://discourse.julialang.org/t/compute-surfaces-of-intersection-between-circles-in-julia-with-libgeos/59811 "2021-04-24T12:55:11Z")
I need to compute surfaces of intersection between different circles. I am used to do it in R with the sf library and it works fine but I need to do it in Julia with the LibGEOS library and it is not as easy… My first q… --- ## [Rasterizing feature data](https://discourse.julialang.org/t/rasterizing-feature-data/59594)
**Author:** [@mihalybaci](https://discourse.julialang.org/u/mihalybaci)\ **Replies:** 17\ **Last updated:** [April 22, 2021, 12:27pm UTC](https://discourse.julialang.org/t/rasterizing-feature-data/59594 "2021-04-22T12:27:18Z")
I have a set of WKT strings that I would like to convert into 256x256 raster images (masks, really). I read them into geometries (specifically, multipolygons) just fine with ArchGDAL.fomWKT, but ArchGDAL.unsafe\_rasterize … --- ## [ArchGDAL.jl (or GDAL.jl not sure) - Undesired behaviour when reprojecting coordinates to EPSG 4326](https://discourse.julialang.org/t/archgdal-jl-or-gdal-jl-not-sure-undesired-behaviour-when-reprojecting-coordinates-to-epsg-4326/59415)
**Author:** [@carlosmolinero](https://discourse.julialang.org/u/carlosmolinero)\ **Replies:** 3\ **Last updated:** [April 16, 2021, 3:24pm UTC](https://discourse.julialang.org/t/archgdal-jl-or-gdal-jl-not-sure-undesired-behaviour-when-reprojecting-coordinates-to-epsg-4326/59415 "2021-04-16T15:24:07Z")
Hello, I am fairly new to Julia and absolutely new to ArchGDAL, so please excuse me if what I am reporting is actually a misconception on my part. I would like to first thank the developers of both the language and the p… --- ## [Implementing SQLite / Spatialite driver](https://discourse.julialang.org/t/implementing-sqlite-spatialite-driver/55840)
**Author:** [@maxfreu](https://discourse.julialang.org/u/maxfreu)\ **Replies:** 13\ **Last updated:** [March 8, 2021, 1:49pm UTC](https://discourse.julialang.org/t/implementing-sqlite-spatialite-driver/55840 "2021-03-08T13:49:43Z")
Hi! I’m sick of the mess shapefiles create and it itches me to write a package for reading geometries from sqlite files (they proved to be rather small and fast last time I tested). Given the simplicity of the WKB format… --- ## [Projecting and interpolating data to a regular grid](https://discourse.julialang.org/t/projecting-and-interpolating-data-to-a-regular-grid/56162)
**Author:** [@johnbb](https://discourse.julialang.org/u/johnbb)\ **Replies:** 9\ **Last updated:** [February 28, 2021, 11:11pm UTC](https://discourse.julialang.org/t/projecting-and-interpolating-data-to-a-regular-grid/56162 "2021-02-28T23:11:31Z")
I have (multiple) data on a regular latlon grid which I want to project with a Lambert conformal conic projection and interpolate to a regular grid. Is using the Proj4 and Interpolations packages an appropriate option or… --- ## [GeoStats.jl Survey 2020](https://discourse.julialang.org/t/geostats-jl-survey-2020/52267)
**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\ **Replies:** 0\ **Last updated:** [December 23, 2020, 10:57am UTC](https://discourse.julialang.org/t/geostats-jl-survey-2020/52267 "2020-12-23T10:57:43Z")
Are you using GeoStats.jl in your work? Please consider this quick survey: https://forms.gle/a5tHHQwc9RudkMzcA We will use the results to better plan our efforts next year. Thank you and happy new year! --- ## [GeoStats.jl Meeting](https://discourse.julialang.org/t/geostats-jl-meeting/51824)
**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\ **Replies:** 2\ **Last updated:** [December 18, 2020, 11:44am UTC](https://discourse.julialang.org/t/geostats-jl-meeting/51824 "2020-12-18T11:44:15Z")
The GeoStats.jl community has grown a lot this year, and we would like to invite all users and contributors to join an informal conversation to get to know each other =) Tell us how you are using the project and what you… --- ## [Creating GRASS.jl good or bad idea?](https://discourse.julialang.org/t/creating-grass-jl-good-or-bad-idea/50495)
**Author:** [@WhiteFenrir](https://discourse.julialang.org/u/WhiteFenrir)\ **Replies:** 5\ **Last updated:** [November 23, 2020, 4:05pm UTC](https://discourse.julialang.org/t/creating-grass-jl-good-or-bad-idea/50495 "2020-11-23T16:05:12Z")
Dear all, I start working with Julia and I feel a lack of integrated GIS package. I can find many packages that sometimes need to be used together to have a full workflow. That is great but the GeoJulia ecosystem still … --- ## [\[PSA\] GADM.jl: A julia package providing maps and spatial data for all countries and their sub-divisions](https://discourse.julialang.org/t/psa-gadm-jl-a-julia-package-providing-maps-and-spatial-data-for-all-countries-and-their-sub-divisions/50203)
**Author:** [@yeesian](https://discourse.julialang.org/u/yeesian)\ **Replies:** 0\ **Last updated:** [November 15, 2020, 11:19pm UTC](https://discourse.julialang.org/t/psa-gadm-jl-a-julia-package-providing-maps-and-spatial-data-for-all-countries-and-their-sub-divisions/50203 "2020-11-15T23:19:09Z")
(Reposting from the #geo channel in Slack) Hi everyone, just wanted to help announce that https://github.com/JuliaGeo/GADM.jl has been released; it is developed by @zerefwayne under https://fellowship.mlh.io/. The packa… --- ## [GMT.jl errors when trying to plot- problem with PNG?](https://discourse.julialang.org/t/gmt-jl-errors-when-trying-to-plot-problem-with-png/47860)
**Author:** [@mihalybaci](https://discourse.julialang.org/u/mihalybaci)\ **Replies:** 4\ **Last updated:** [October 6, 2020, 4:33pm UTC](https://discourse.julialang.org/t/gmt-jl-errors-when-trying-to-plot-problem-with-png/47860 "2020-10-06T16:33:43Z")
For some reason, I cannot get GMT.jl to work. When I attempt to do the “Hello, World” example plot I get the following message: Error: /undefined in PSL\_movie\_label\_completion (skipping the stacktrace...) ERROR: Some… --- ## [Intersection and union of polygons - IoU Metric](https://discourse.julialang.org/t/intersection-and-union-of-polygons-iou-metric/45506)
**Author:** [@maxfreu](https://discourse.julialang.org/u/maxfreu)\ **Replies:** 2\ **Last updated:** [September 22, 2020, 11:47am UTC](https://discourse.julialang.org/t/intersection-and-union-of-polygons-iou-metric/45506 "2020-09-22T11:47:22Z")
Hi! I would like to compute the intersection over union metric for polygons (concave polygons with holes). Is there a package which implements calculating the intersecting polygon, the union polygon as well as their are… --- ## [ArchGDAL.getfield() error](https://discourse.julialang.org/t/archgdal-getfield-error/45770)
**Author:** [@erlebach](https://discourse.julialang.org/u/erlebach)\ **Replies:** 2\ **Last updated:** [September 6, 2020, 6:01pm UTC](https://discourse.julialang.org/t/archgdal-getfield-error/45770 "2020-09-06T18:01:02Z")
Hi, I have the following code which aims to transform the data contained in a layer into a DataFrame, which I picked up online. This works for the most part. Notice the try/catch, which slows the code down a lot, and I … --- ## [(geometry)Rotating Calipers / Oriented Minimum Bounding Box?](https://discourse.julialang.org/t/geometry-rotating-calipers-oriented-minimum-bounding-box/44058)
**Author:** [@anon92994695](https://discourse.julialang.org/u/anon92994695)\ **Replies:** 5\ **Last updated:** [August 26, 2020, 10:55am UTC](https://discourse.julialang.org/t/geometry-rotating-calipers-oriented-minimum-bounding-box/44058 "2020-08-26T10:55:50Z")
Are there any implementations for, rotating calipers algorithm or any oriented minimum bounding box here in Julia? I could whip one up if not, but preferably one of you wizards has one out there somewhere. --- ## [ArchGDAL - memory issue with vector data](https://discourse.julialang.org/t/archgdal-memory-issue-with-vector-data/42827)
**Author:** [@julien\_goo](https://discourse.julialang.org/u/julien_goo)\ **Replies:** 3\ **Last updated:** [July 17, 2020, 6:20am UTC](https://discourse.julialang.org/t/archgdal-memory-issue-with-vector-data/42827 "2020-07-17T06:20:29Z")
Hello all, I’m starting to use geo data in Julia with ArcGDAL, after using the R sf package for a while. My use case is simple : I have WGS 84 positions and I want to guess the timezone they belong to. I have the world… --- ## [Need Gibbs Seawater (GSW) Equation of State to be ported to Julia](https://discourse.julialang.org/t/need-gibbs-seawater-gsw-equation-of-state-to-be-ported-to-julia/30476)
**Author:** [@truedichotomy](https://discourse.julialang.org/u/truedichotomy)\ **Replies:** 25\ **Last updated:** [July 12, 2020, 9:21pm UTC](https://discourse.julialang.org/t/need-gibbs-seawater-gsw-equation-of-state-to-be-ported-to-julia/30476 "2020-07-12T21:21:55Z")
The Gibb Seawater Equation of State (GSW) is what oceanographers use to calculate fundamental properties of seawater. Currently there are a couple implementation of the C version of the library in Julia but none of them … [Previous page](https://discourse.julialang.org/c/domain/geo/18.md?page=4) [Next page](https://discourse.julialang.org/c/domain/geo/18.md?page=6)