[Proj] PROJ 5.0.0RC5

Thomas Knudsen knudsen.thomas at gmail.com
Thu Mar 1 02:15:47 EST 2018 

Actually, it seems related to handling of the null grid specificly: When
using the conus grid, the 10 km jump into the lithosphere is avoided
(although we get the 2D correction we ask for, but really don't want):

$ echo 487147.594520173 4934316.46263998 0 | cs2cs -f %.16f %FROM% +to
+proj=latlong +datun=NAD83 | cs2cs +proj=latlong +datum=NAD83 +to
+proj=merc +R=6378137 +nadgrids=conus

> -10370704.71    5552845.16    -0.00

Note: Height set to negative zero... not sure yet whether this is a hint






2018-03-01 7:58 GMT+01:00 Thomas Knudsen <knudsen.thomas at gmail.com>:

> Jeff,
>
> That's interesting (although annoying!)
>
> When I leave out the final nadgrids=@null, I get the correct result from
> PROJ v5RC6. Can you reproduce that?
>
> Note, I'm not implying that this should be considered a solution or
> workaround, merely trying to narrow in on the
> problem, which seems to be related to datum handling.
>
> /Thomas
>
>
>
>
>
> 2018-03-01 0:38 GMT+01:00 Jeff McKenna <jmckenna at gatewaygeomatics.com>:
>
>> Update: I never heard back from anyone else about testing PROJ v5 +
>> MapServer (and GDAL), so in fact I may be the only person to test this
>> combination so far.  Because this is a PROJ mailing list I first give
>> some more feedback with PROJ utilities, then later will list results
>> from other software for anyone interested.  (in reality I first noticed
>> the problem in MapServer but then each test in GDAL then PROJ failed as
>> well, on Windows with PROJ 5.0.0-RC6)
>>
>> cs2cs
>> =====
>>
>> I wanted to test PROJ v5 by using a point
>> (487147.594520173,4934316.46263998) in EPSG:26915 (UTM Zone 15) and
>> reprojecting that to EPSG:3857 (Google's Mercator).
>>
>> with PROJ 4.9.3
>> ---------------
>>
>> cs2cs -v +proj=utm +zone=15 +datum=NAD83 +to +proj=merc +a=6378137
>> +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m
>> +nadgrids=@null
>> # ---- From Coordinate System ----
>> #Universal Transverse Mercator (UTM)
>> #       Cyl, Sph
>> #       zone= south
>> # +proj=utm +zone=15 +datum=NAD83 +ellps=GRS80 +towgs84=0,0,0
>> # ---- To Coordinate System ----
>> #Mercator
>> #       Cyl, Sph&Ell
>> #       lat_ts=
>> # +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0
>> +y_0=0 +k=1.0
>> # +units=m +nadgrids=@null
>> 487147.594520173 4934316.46263998
>>
>> RESULT POINT: -10370728.80    5552839.74 -0.00
>>
>> with PROJ 5.0.0-RC6
>> -------------------
>>
>>  >cs2cs -v +proj=utm +zone=15 +datum=NAD83 +to +proj=merc +a=6378137
>> +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m
>> +nadgrids=@null
>> # ---- From Coordinate System ----
>> #Universal Transverse Mercator (UTM)
>> #       Cyl, Sph
>> #       zone= south
>> # +proj=utm +zone=15 +datum=NAD83 +ellps=GRS80 +towgs84=0,0,0
>> # ---- To Coordinate System ----
>> #Mercator
>> #       Cyl, Sph&Ell
>> #       lat_ts=
>> # +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0
>> +y_0=0 +k=1.0
>> # +units=m +nadgrids=@null
>> 487147.594520173 4934316.46263998
>>
>> RESULT POINT: -10370728.80    5522830.15 -10484.03
>>
>> Discussion
>> ----------
>>
>> PROJ 4.9.3 returns the correct value (I've confirmed this with many
>> other tools including QGIS).  Can someone explain why those 2 results
>> are different? (I have reproduced this problem on Windows and also
>> Ubuntu 14.94)
>>
>> GDAL
>> ====
>>
>> I wanted to test PROJ v5 by using that same test point (as a shapefile)
>> in EPSG:26915 (UTM Zone 15) and reprojecting that to EPSG:3857 (Google's
>> Mercator), using GDAL's ogr2ogr command.  (data used:
>> https://www.gatewaygeomatics.com/dl/parcels-proj-v5-test.zip )  Below I
>> have used the ogr2ogr command (included in the "commands.txt" file in
>> that data download) and then ogrinfo on the reprojected file to output:
>>
>> with PROJ 4.9.3
>> ---------------
>>
>> POINT (-10370728.7959208 5552839.74177463)
>>
>> with PROJ 5.0.0-RC6
>> -------------------
>>
>> POINT (-10370728.7959208 5522830.1464459)
>>
>> Discussion
>> ----------
>>
>> PROJ 4.9.3 compiled into GDAL 2.2.3 returns the correct point value, but
>> returns a different point value with PROJ 5.0.0-RC6
>>
>> MapServer
>> =========
>>
>> Same problems as GDAL (reprojected layer has different extents with PROJ
>> 5.0.0-RC6, causing problems to display the reprojected layer in a map
>> image).
>>
>>
>> If you made it this far in my long email, thanks for listening (I am
>> totally stumped on this one, again ha).
>>
>> -jeff
>>
>>
>>
>>
>>
>> On 2018-02-25 3:45 PM, Kristian Evers wrote:
>> > Thanks for testing, Jeff. It is very appreciated. I hope you sort of
>> your problems,
>> > PROJ-related or not.
>> >
>> > /Kristian
>> >
>> >> On 25 Feb 2018, at 00:29, Jeff McKenna <jmckenna at gatewaygeomatics.com>
>> wrote:
>> >>
>> >> Update: it seems many things were happening, causing me to look in
>> wrong
>> >> places.  But in the end MapServer was in fact reprojecting the points;
>> >> what caused me total confusion was that I was testing with several
>> >> MapServer-related applications that are part of MS4W (Mapbender,
>> >> GeoMOOSE) and one application had a totally blank opening map image
>> with
>> >> PROJ v5.  In fact for some reason the old hardcoded map extents
>> >> (displayed in EPSG:3857) no longer display the data (you have to now
>> >> zoom out a bit to see the data, reprojected with PROJ v5).  I'll
>> contact
>> >> the GeoMOOSE team to let them dive into this (still, it could be my
>> >> Windows environment, as no one else seems to be testing MapServer +
>> PROJ
>> >> v5 yet).
>> >>
>> >> Very sorry for all this noise!
>> >>
>> >> Short story: all is fine with RC5 here.
>> >>
>> >> Thank you again Kristian for your passion driving this.
>> >>
>> >> -jeff
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> On 2018-02-23 5:33 PM, Jeff McKenna wrote:
>> >>> Hi Kristian,
>> >>>
>> >>> No problems here on Windows in the MS4W environment, but I'm running
>> >>> into odd errors when I have MapServer call PROJ 5
>> >>> (https://lists.osgeo.org/pipermail/mapserver-dev/2018-Februa
>> ry/015347.html).
>> >>>    Obviously an issue downstream not here, but I thought I'd at least
>> >>> mention it here that I am testing RC5 as well :)
>> >>>
>> >>> Thanks for pushing this release along.
>> >>>
>> >>> -jeff
>> >>>
>> >>>
>> >>>
>> >>>
>> >>> On 2018-02-23 3:19 PM, Kristian Evers wrote:
>> >>>> All,
>> >>>>
>> >>>> I have prepared PROJ 5.0.0RC5. Downloads are here:
>> >>>>
>> >>>>
>> >>>> http://download.osgeo.org/proj/proj-5.0.0RC5.tar.gz (
>> http://download.osgeo.org/proj/proj-5.0.0RC5.tar.gz.md5)
>> >>>> http://download.osgeo.org/proj/proj-5.0.0RC5.zip (
>> http://download.osgeo.org/proj/proj-5.0.0RC5.zip.md5)
>> >>>>
>> >>>>
>> >>>> Since RC4 problems with vertical grid installation, the Horner
>> >>>> transformation and faulty polygon area calculation
>> >>>> in geodesic library has been fixed. Hopefully this will be the final
>> >>>> release candidate. I will call for a vote for
>> >>>> promotion to final release on the 27th. Unless serious issues are
>> >>>> discovered in the mean time.
>> >>>>
>> >>>> /Kristian
>> >>>>
>> >>>>
>> _______________________________________________
>> Proj mailing list
>> Proj at lists.maptools.org
>> http://lists.maptools.org/mailman/listinfo/proj
>>
>
>
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