<html>
<head>
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">On 12/18/2014 06:35 PM, Kari Salovaara
wrote:<br>
</div>
<blockquote cite="mid:54931064.2030806@pp1.inet.fi" type="cite">Hi,
<br>
<br>
in Finland we have map datasets free of charge to download from
The National Land Survey of Finland (NLS). See
<a class="moz-txt-link-freetext" href="http://www.maanmittauslaitos.fi/en/opendata">http://www.maanmittauslaitos.fi/en/opendata</a>
<br>
From Topographic Database You can download in ESRI shape format
any Finnish map area. In each area You'll get a number of
shapefiles related to category and each category has also a *.prj
file.
<br>
<br>
The problem arises when You make a layer from any of these
shapefiles in following example;
<br>
1. set project CRS to Finnish ESPG:3067 ( which is on the list
EPSG:3067 - ETRS89 / ETRS-TM35FIN)
<br>
2. make a layer from shapefile, as it has *.prj which starts like
PROJCS["ETRF89_ETRS_TM35FIN",GEOGCS["GCS_ETRS89",DATUM["D_ETRS_1989"....
<br>
You expect the layer CRS to be 3067 but when You look to layer
properties it shows 3047 (in the dialog list EPSG:3047 - ETRS89 /
ETRS-TM35)
<br>
(which means, I think,
PROJCS["ETRF89_ETRS_TM35",GEOGCS["GCS_ETRS89",DATUM["D_ETRS_1989")...
small but nasty difference.
<br>
<br>
This problem can cause difficulties when creating scripts for
automation etc.
<br>
And very odd is that when You have created an empty project with
CRS set to 3067 and create a shapefile its *.prj file starts
PROJCS["ETRS89_TM35FIN_E_N",GEOGCS["GCS_ETRS_1989",DATUM["D_ETRS_1989",
<br>
but in this case the EPSG is 3067.
<br>
<br>
For my knowledge ETRS-TM35FIN is always and only EPSG:3067.
<br>
<br>
Could someone explain is this failure in QGIS or GDAL/OGR or
PROJ.4?
<br>
This problem has been tested in 2.6.1 (latest update in
OpenSuse12.3) and 2.7.0 (nightly) versions and both linux and win
7 environments.
<br>
Finnish QGIS society are waiting this Christmas Question answer
with interest. ;)
<br>
<br>
With warm and kind regards,
<br>
Kari
<br>
<br>
PS. This has been discussed here locally without any final
understanding. Some guess has been that program only looks and
takes first some nearly suitable code and uses it.
<br>
<br>
</blockquote>
It seems the proj4 string for both CRS is the same in my local
installation. Is it the same for you ? In that case, they are
exactly equivalent for QGis. When QGis finds a dataset without a
clear CRS code, it will parse the proj4 string to find the
coordinate system and stop at the first corresponding one.<br>
<br>
Regards,<br>
<br>
Leyan<br>
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
<style type="text/css">
p, li { white-space: pre-wrap; }
</style><br>
</body>
</html>