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Planetary Coordinate Reference Systems There is an interesting but perhaps little-used folder of *.prj files called “Solar System”. As someone interested in geodesy and its application it is particularly intriguing how scientists have constructed coordinate reference systems for planetary bodies other than the Earth.   First off let’s have a look… (Show more)
Vincenty's Formulae are two methods named after Thaddeus Vincenty a Polish-American geodesist who lived during the 20th Century. During his career, he devised his formulae as well as contributing to major projects such as the NAD 83 where he introduced three-dimensional Earth-centered coordinates. Vincenty's formulae were published in 1975 and it… (Show more)
I decided to look into some of the mathematics that makes it possible to calculate distances considering 3D space, for example, calculating distance on a sphere. You can find our more on geodesic distances from the previous blog (Geodesic distances: How long is that line again? ).   The Earth is round but big, so we can consider it flat for short… (Show more)
This is going to sound pretty basic but when I change the projection  of my shape file ( WGS 1984 Web Mercator Auxiliary Sphere to USA_Contiguous_Lambert_Conformal_Conic) it says the Projection is completed successfully but nothing happens. Don't really know what else to explain, thanks
in map projections
My team is looking for a new member. Here's the job posting    Feel free to contact me for more details or questions, but all resumes must go through the usual submission process (via the Careers website).   OVERVIEWDo you think map projections are cool? Know what a datum is? As a projection engine product engineer, you will help build and… (Show more)
I have 2 shapefiles from a few years ago that I did not author. One is in NAD27 UTM 10, the other is in NAD83 UTM 10. . There was a map request that includes this data. We have a standard practice of using NAD83 HARN SPS. The Data frame and all other associated data is in SPS. When I added the layer the data was off by a few meters, and I assumed… (Show more)
in map projections
Introduction The Global Geodetic Reference Frame (GGRF) is the realisation of the Global Geodetic Reference System (GGRS). The GGRS comprises terrestrial and celestial components allowing users to precisely determine and express locations on the Earth, as well as to quantify changes of the Earth system in space and time.    What is the GGRF?… (Show more)
Hello!   I have a list of shapefiles that I am trying to merge together to create one larger shapefile. The issue here is that these shapefiles have different coordinate systems. The list below identifies all the different datums and coordinate systems I am working with. The top of each category in bold is the Datum followed by the italicized… (Show more)
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I am trying to digitize an old map. The projection is Lambert Conical Orthomorphic, It is a southern hemisphere map I  georeference the map (it is a scanned image, I've tried various projections) it appears to georeferecnce OK. But when I try to digitize various features as a layer, the digitised vector layers are (flipped over and spun thru 180… (Show more)
in map projections
Hi Everyone,   I am working with NASA data in ArcGIS and am having a problem with displaying the longitude correctly. I have attached a screenshot, unfortunately the file is too large. This file should be over Japan but it appears over the Atlantic. Here is my workflow: 1. In HDFView, convert file from .nc to .h5. Arc seems to handle h5 much… (Show more)
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