Proj4

Coordinate system conversions are needed for several SCEC projects.

Example Conversions

Converting WGS84 to UTM Zone 11 using cs2cs

• cs2cs -v +proj=latlong +datum=WGS84 +to +proj=utm +zone=11 +datum=WGS84

-bash-4.2$ cs2cs -v +proj=latlong +datum=WGS84 +to +proj=utm +zone=11 +datum=WGS84
# ---- From Coordinate System ----
#Lat/long (Geodetic alias)
#	
# +proj=latlong +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
# ---- To Coordinate System ----
#Universal Transverse Mercator (UTM)
#	Cyl, Sph
#	zone= south
# +proj=utm +zone=11 +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
-118.00 34.00
407650.40	3762606.66 0.00

Online Implementation

• CS2CS Online

FAQ

• Online FAQ
• what is the third return parameter in UTM values
  • input lat/long can include elevation. Third returned UTM param is elevation. When no lat/lon elevation used, utm return elev is 0.0
• What is the +no_defs parameters?
  • "The "no_defs" item ensures that no defaults are read from the defaults files. Sometimes they cause suprising problems." http://lists.osgeo.org/pipermail/mapserver-users/2003-November/046863.html

Building Proj4

• Proj4 built on Centos using the ./configure make, make install. Since we are building on a shared cluster, we needed to ./configure --prefix=/user/scec-00/maechlin/workspace/proj4 (installation path to local directory)
• Installation of proj4 on Mac (high sierra) failed.
• Installation of current proj4 on USC HPC succeeded.
• Didn't try installing pyproj on Mac. It can use either installed proj4, or try to build its own
• Used conda install pyproj on Anaconda 2 instance on USC HPC

Online Documentation

• UCVM-P Example Strings
• Proj4 wikibooks
• Defines return paramater elevation
• Proj4 Examples
• C example

Downloads and Documentation

• Proj4 Download - Proj4 4.9.3
• Prog4 Website

• PyProj Download - pyproj 1.9.5.1
• PyProj Documentation]

Related Entries

• High-F
• UCVM