Cleo Drakos | 23 Aug 08:38 2014
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Convert the array into required coordinates

Dear guys,

I have 2d numpy array of 480 rows and 1440 columns as named by 'data' below:

The first element belongs to (49.875S,179.875W), the second element belongs to (49.625S,179.625W), and the last element belongs to (49.875N,179.875E). import os, glob, gdal, numpy as np fname = '3B42RT.2014010606.7.bin' with open(fname, 'rb') as fi: fi.seek(2880,0) data = np.fromfile(fi,dtype=np.uint16,count=480*1440) data = data.byteswap() data = data.reshape(1440,480)

How can I convert this numpy array so that its first element belongs to (49.875N,179.625W), i.e., upper left latitude and longitude respectively; and the last element belong to (49.625S,179.875E), i.e., lower right latitute and longitude respectively.

I tried to rotate it, but I do not think it is correct.

data = np.rot90(data,1)

Have some of you experienced with this type of problem? The binary file I am using is here:ftp://trmmopen.gsfc.nasa.gov/pub/merged/3B42RT/3B42RT.2014010606.7.bin.gz

cleo
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Aleksander Yanovskiy | 21 Aug 09:35 2014
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direct geodesic problem

Greetings!

Maybe somebody can clarify how to solve the following direct geodesic 
problem: find the end point of a geodesic given its starting point and 
initial azimuth and the angle between the tangent planes at the 
beginning and the end points (or, equivalently, the angel between the 
normals at the points).
It seems the most easy way is to find the corresponding arc length on 
the auxiliary sphere, but I haven't found anywhere the explicit formula 
for it as the function of the point coordinates, the azimuth and the 
angle between the tangent planes at the beginning and the end points. 
And I'm not sure that such formula would be valid for the the beginning 
and the end points laying in different hemispheres.

And why is the geodesic problem in such formulation not being used in 
practice ?

Sincerely,
Aleksander
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Chris HUDDART | 18 Aug 19:04 2014

Does anyone know of any Ebola mapping activities?

Dear All,

 

Does anyone know of any West Africa Ebola mapping activities?

 

Many thanks & regards,

 

 

 

Chris.

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Cleo Drakos | 18 Aug 16:13 2014
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Can I convert the ellipsoids using Proj?

Dear guys,

I have the data (latitudes, longitudes, and elevations) given in ICESat/GLAS ellipsoid. This equatorial radius and  reciprocal flattening (1/f) on this ellipsoid are 6378136.30 m and is 298.257 respectively.

Now, I want to convert my data into WGS84 ellepsoid with equatorial radius and reciprocal flattening (1/f) of 6378137.000000 and 298.25722356 respectively.

Can I convert the ellipsoids using Proj?

I hope some of you can help me.

cleo
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Roger Bivand | 18 Aug 11:32 2014
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#229 - trunk init still broken

Please could someone patch pj_init.c with the bugfix for the missing 
found_def after line 263? The fix has been known for months, but no action 
has been taken.

Roger

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Charles Karney | 10 Aug 23:49 2014

rhumb lines + arbitrary precision arithmetic

I've released version 1.37 of GeographicLib.  See

   http://geographiclib.sf.net/html/changes.html

A couple of items might be of interest to the readers of this list.

(1) Classes and a utility for computing rhumb lines.  For details, see

   http://geographiclib.sf.net/html/rhumb.html

(2) Support for high precision arithmetic.  A compilation option is
provided to allow linking against Boost (for quad precision) or MPFR
(for arbitrary precision).  Thanks to C++'s operator overloading this
entailed minimal changes to the code itself.  For details, see

   http://geographiclib.sf.net/html/highprec.html

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Even Rouault | 14 May 12:56 2014

Update of EPSG database to v8.4

Hi,

I've followed the update process of the EPSG SRS database to latest v8.4, and 
just committed the updated files into libgeotiff, GDAL and PROJ trunk. Also 
submitted to PostGIS.

From what I can see, among many changes and additions, 2 new projection 
methods have been added:
* 1051,Lambert Conic Conformal (2SP Michigan)
--> looks very close to standard "Lambert Conic Conformal (2SP)", with the 
addition of a new parameter K, the ellipsoid scaling factor.
* 1052,Colombia Urban

I don't think any of those 2 new methods are currently handled by PROJ, so the 
new PCS based on those projection methods (3 Michigan SRS, and several dozains 
of Colombia PCS) will not be handled by GDAL nor PROJ.

Regarding GDAL, I've improved the add_esri_column.py script (see 
http://trac.osgeo.org/geotiff/changeset/2446), so that we have more ESRI DATUM 
names. That should make morphing from/to ESRI .prj files a bit better.

Regarding PROJ.4 'espg' and PostGIS spatial_ref_sys.sql files, I've also added 
the list of SRS that are GEOCCS (GeoCentric) and COMPD_CS (Compound Horizontal 
+ Vertical).

Please let me know if you see issues.

libgeotiff:
http://trac.osgeo.org/geotiff/ticket/63
http://trac.osgeo.org/geotiff/changeset/2447

GDAL:
http://trac.osgeo.org/gdal/ticket/5462
http://trac.osgeo.org/gdal/changeset/27322

PROJ:
http://trac.osgeo.org/proj/ticket/236
http://trac.osgeo.org/proj/changeset/2448

Submitted for PostGIS :
http://trac.osgeo.org/postgis/ticket/2737

Best regards,

Even

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Irwin Scollar | 10 May 17:29 2014
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Hough Ellipse

I am working on a program for geometric 
correction of the Corona KH4, 4A and 4B satellite 
imagery which was declassified in 1995 and is now 
available from the web site of the USGS & EROS data center.

https://lta.cr.usgs.gov/declass_1

The panoramic image strips cover vast areas of 
roughly 3000 sq. km at 2 to 4 meters per pixel, 
depending on the satellite height.  USGS supplies 
a metadata file with the corner and center points 
of each image given in latitude and longitudes.

In

Image Coverage Models for Declassified Corona, 
Argon and Lanyard Satellite Photography, A 
Techical Expanation by J. Michael Sélander, in:

CORONA: Between the Sun & the Earth: The First 
NRO Reconnaissance Eye in Space. Robert McDonald, 
ed. Bethesda, Md.: ASPRS, 1997.

on page 181, it is stated that the coordinate 
database uses the Hough Ellipsoid (1960).  :

Parameters are given for this ellipsoid in the table:

http://geoengine.nga.mil/geospatial/SW_TOOLS/NIMAMUSE/webinter/geotrans2/help/elliptab.htm

Although called Hough in honor of F. Hough,  it 
appears to have been the work of that remarkable 
lady Dr. Irene Fischer who lived to be 102 and 
see her work incorporated into WGS84.  See:

http://en.wikipedia.org/wiki/Irene_Fischer

Fischer, Irene. 1959. "A Tentative World Datum 
from Geoidal Heights Based on the Hough Ellipsoid 
and the Columbus Geoid". Journal of Geophysical Research. 64 (1): 73-84

Can anyone offer some ideas about the amount of 
error which would be introduced by mixing Hough 
lat/lons and WGS84 lat/lons obtained from Google 
Maps/ Google Earth when georeferencing the Corona 
imagery for further processing in GIS 
programs?  Or are Bursa-Wulff or Helmert datum 
transformation  parameters available somewhere?

Irwin Scollar

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Andrea Peri | 8 May 19:27 2014
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Info on proj4 formulas

Hi,

I'm just now subscribe to this MialingLIst so before all
My best wish to all the readers.
:)

I'm searching info about what formula is use in the proj4 to reproiect data.
There is a document where is describe the used formulas. ?

I need to understand how far is the proj4 results from other tools used in Italy

AFAIK in Italy is used a formula usually know as the "Formula's Bonifacino".

Thx,

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Charles Karney | 29 Apr 15:14 2014

New NGA documents on UTM/UPS/MGRS; time to update proj.4 implementation of UTM?

NGA has recently published

   Universal Grids and Grid Reference Systems, Feb 2014,
   https://nsgreg.nga.mil/doc/view?i=4057

   The Universal Grids and the Transverse Mercator and Polar
   Stereographic Map Projections, Mar 2014
   https://nsgreg.nga.mil/doc/view?i=4056

These are revisions of

   TM8358.1: Datums, Ellipsoids, Grids and Grid Reference Systems,
   Sep 1990
   http://earth-info.nga.mil/GandG/publications/tm8358.1/pdf/TM8358_1.pdf

   TM8358.2: The Universal Grids: Universal Transverse Mercator (UTM) and
   Universal Polar Stereographic (UPS), Sep 1989
   http://earth-info.nga.mil/GandG/publications/tm8358.2/TM8358_2.pdf

NGA is now recommending the algorithms implemented in etmerc for the UTM
system.  So it would probably be a good idea if proj.4 had "utm" hooked
up to "etmerc" instead of the older (and less accurate) "tmerc"
algorithm.

See also
   http://trac.osgeo.org/proj/ticket/222

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Mikhail Tchernychev | 26 Apr 01:07 2014

possible bug in proj.exe 4.8.0 under Windows with -V

Hi, Just wanted to let you know that it appeared to be a problem with -V 
under windows.

Here is sample session:

C:\Windows\System32>proj   +proj=tmerc +lon_0=-75  +ellps=clrk66 -V 
+k_0=0.9996
-
#Transverse Mercator
#       Cyl, Sph&Ell
# +proj=tmerc +lon_0=-75 +ellps=clrk66 +k_0=0.9996
#Final Earth figure: ellipsoid
#  Major axis (a): 6378206.400
#  1/flattening: 294.978698
#  squared eccentricity: 0.006768657997
-75.5 40.5
Rel. 4.8.0, 6 March 2012
<proj>: while processing file: <stdin>, line 1
Unknown error

The same sequence works fine under Linux.

I hope it helps,

Mikhail

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