[Proj] Fwd: proj4 definition for European Forest Map

[Agustin Lobo]

Obrigado!
Agus

2010/6/24 Jose Gonçalves <jagoncal at gmail.com>:
> Hello
>
> The third definition is ok. Since you are specifying both semi-axis the
> flattening is redundant. The first is wrong because +rf should be infinite
> in the case of the sphere. Within PROJ syntax you could also use:
>
> proj +proj=laea +lat_0=48 +lon_0=9 +x_0=0 +y_0=0 +R=6378388 +units=m
> +no_defs
>
> Regards
>
> José A. Gonçalves
>
>
>
> 2010/6/24 Agustin Lobo <alobolistas at gmail.com>
>>
>> Hi!
>>
>> The European Forest Map has the following projection (according to a
>> file distributed along with the file):
>>
>> Projection: Lambert_Azimuthal_Equal_Area
>> Parameters:
>>  False_Easting: 0.000000
>>  False_Northing: 0.000000
>>  Central_Meridian: 9.000000
>>  Latitude_Of_Origin: 48.000000
>> Linear Unit: Meter (1.000000)
>> Coordinate system
>> Geographic Coordinate System:
>> Name: GCS_User_Defined
>> Angular Unit: Degree (0.017453292519943299)
>> Prime Meridian: Greenwich (0.000000000000000000)
>> Datum: D_User_Defined
>>  Spheroid: User_Defined_Spheroid
>>  Semimajor Axis: 6378388.000000000000000000
>>  Semiminor Axis: 6378388.000000000000000000
>>  Inverse Flattening: 0.000000000000000000
>>
>> I've made several trials to set up a custom projection (in QGIS):
>> 1.
>> +proj=laea +lat_0=48 +lon_0=9 +x_0=0.000 +y_0=0.000 +a=6378388.0000
>> +b=6378388.000 +rf=0.000 +units=m +no_defs
>> Rejected by the custom projection tool as erroneous
>>
>> 2.
>> +proj=laea +lat_0=48 +lon_0=9 +x_0=0.000 +y_0=0.000 +a=6378388.0000
>> +b=6378388.000 +f=0.000 +units=m +no_defs
>> Accepted by the custom projection tool but the Properties dialog does
>> not accept it
>>
>> 3.
>> +proj=laea +lat_0=48 +lon_0=9 +x_0=0.000 +y_0=0.000 +a=6378388.0000
>> +b=6378388.000 +units=m +no_defs
>> Seems to work fine.
>>
>> I'd like if someone could actually confirm that the third proj4
>> definition is actually
>> in accordance with the definition provided in the server and that I
>> have reproduced at the beginning of this
>> message. I'm not sure if option 1 and 2 are rejected because they are
>> wrong or
>> this is a QGIS problem (message sent to the QGIS list remains unanswered).
>>
>> I also would like answer if there is a document instructing how to
>> translate PROJCS specifications
>> into proj4 format.
>>
>> Thanks!
>>
>> Agus
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>
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