[Proj] Projection conversion problem
nhv at cape.com
Tue Jun 28 11:06:30 EST 2016
I believe you are looking for the plate caree projection
from: +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs
to: +proj=eqc +lat_ts=0 +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs
"eqc" above is "Equidistant Cylindrical (Plate Caree)" - which is an alias of OGC WKT Name: "Equirectangular"
You will need to truncate this to integer
> On Jun 28, 2016, at 11:43 AM, Damian Rakowski <damian.rakowski at yahoo.com> wrote:
> Thank you for your reply. That's true i can convert it using scripts,
> but I was thinking about different use case. I had a hope that thanks to
> proj integration in postgis I could define new coordinate system with
> proper proj configuration string (similar to this one:
> http://spatialreference.org/ref/epsg/4326/postgis/), and use such
> encoded coordinates directly in postgis.
> Best Regards,
> W dniu 2016-06-27 o 20:14, Hermann Peifer pisze:
>> On 2016-06-27 11:43, Damian Rakowski wrote:
>>> I have coordinates in WGS84 like:
>>> 2.2945 48.858222
>>> and I need to transform them to WGS84-like projection with different
>>> unit - encoded on integer.
>>> Basically what I need to do is to transform coordinates in the following
>>> floor(coordinate * 2^32/360)
>>> 2^32/360 = 11930464,711111111111111111111111
>>> After conversion I expect to get the following coordinates:
>>> 27374451 582901293
>> This looks like Garmin's "semicircle units". You don't need proj for
>> calculating them. Any of awk/perl/python/ruby/... will do.
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