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Do you know any repository where can i find .prj files?

I am looking for local coordinate system: Warszawa 75 (Warsaw 75)

I found myself this repository but the .prj which i found there seems to be broken.

com
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  • The oens I would search for are : Pulkovo 1942 Adj 1958 Poland Zone I.prj, Pulkovo 1942 Adj 1958 Poland Zone II.prj, Pulkovo 1942 Adj 1958 Poland Zone III.prj, Pulkovo 1942 Adj 1958 Poland Zone IV.prj, Pulkovo 1942 Adj 1958 Poland Zone V.prj AND ETRS 1989 Poland CS2000 Zone 5.prj, ETRS 1989 Poland CS2000 Zone 6.prj, ETRS 1989 Poland CS2000 Zone 7.prj, ETRS 1989 Poland CS2000 Zone 8.prj OR ETRS 1989 Poland CS92.prj with the last one being my best guess. – Hairy Apr 28 '11 at 14:36
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    if you assign a projection, transform to another projection and your data is not in the right place. Your original guess of which projection your data is in was wrong. You should start over and discover the correct prj for your data. – Brad Nesom Apr 28 '11 at 14:38
  • You're right, but the point is that I surely know that the data is in this coordinate system and it is not a guess (i know it from the data author). – com Apr 28 '11 at 15:17
  • The clearest way that the data author could communicate the coordinate system to you is to supply you with the .prj file (or the equivalent in a metadata format). Otherwise, we have to suspect some kind of miscommunication or even misunderstanding on the author's part. Although it's possible that a standard .prj file is in error, that is a far less likely explanation. – whuber Apr 28 '11 at 15:49
  • unprojected data (no prj) overlaid with projected data (the same crs) will produce proof of the suspected projection. – Brad Nesom Apr 28 '11 at 18:12
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    The Esri/prj definitions are incorrect. The OGC human-readable defn looks better: PROJCS["unnamed",GEOGCS["GRS 1980(IUGG, 1980)",DATUM["unknown",SPHEROID["GRS80",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]],PROJECTION["Oblique_Stereographic"],PARAMETER["latitude_of_origin",52.2385990793],PARAMETER["central_meridian",21.0114585301],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",-0],UNIT["Meter",1]] BUT the projection name should be "Double_Stereographic". GRS80 can't be used for Warsaw 72, so the GCS/Datum info is wrong. – mkennedy Apr 29 '11 at 23:18
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    Based on other stereographic-based definitions for Poland, the scale factor probably shouldn't be 1.0 and there should be false easting and false northing values. EPSG doesn't have any definitions that match these values. – mkennedy Apr 29 '11 at 23:26

3 Answers3

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Besides agreeing with Brad / whubber on everything they've said, I suggest a google search, an examination of your metadata, and an examination of the coordinates in ArcMap. Drop it in a fresh map, and look at the coordinates. This may give you some clues. As for the other info I've suggested, see all the comments at this link as well.

Copy and paste the name of the original shapefile in google (including the .shp extension). It may reveal nothing, but you may also be surprised whet you find out!! People underestimate google searches!!!!

Community
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Dano
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There is also a site called http://epsg2prj.org/. But seems to be down at the moment.

maning
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PROJCS["PUWG_42_Strefa_3",GEOGCS["GCS_Pulkovo_1942",DATUM["D_Pulkovo_1942",SPHEROID["Krasovsky_1940",6378245,298.3]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",3500000],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",15],PARAMETER["Scale_Factor",1],PARAMETER["Latitude_Of_Origin",0],UNIT["Meter",1]]

http://spatialreference.org/ref/sr-org/102/

Hairy
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  • I worte that I was looking for Warszawa 75 not PUWG 42. – com Apr 28 '11 at 14:06
  • You wrote: i want to transform shapefile to well known coordinate system (PUWG 1992) – Hairy Apr 28 '11 at 14:12
  • anyhoo, the prj was here: PROJCS["Stereographic_North_Pole",GEOGCS["GRS 1980(IUGG, 1980)",DATUM["D_unknown",SPHEROID["GRS80",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Stereographic_North_Pole"],PARAMETER["standard_parallel_1",52.2385990793],PARAMETER["central_meridian",21.0114585301],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",-0],UNIT["Meter",1]] – Hairy Apr 28 '11 at 14:12
  • Yes, but this is just a mistake. This is not .prj for Warszawa 75. That's the point! – com Apr 28 '11 at 14:14
  • I'd suggest you rewrote the question as it's not entirely clear what you do actually want – Hairy Apr 28 '11 at 14:17
  • I just want .prj file for Warsaw 75 coordinate system (as i already wrote) – com Apr 28 '11 at 14:18
  • and you have it – Hairy Apr 28 '11 at 14:27