TU ANUNCIO / YOUR PUBLICITY

AQUÍ PODRÍA ESTAR TU ANUNCIO: / HERE COULD BE YOUR AD E-mail

domingo, 27 de abril de 2014

How to georeference photo files / Cómo georeferenciar archivos fotográficos


1º Instalamos lo necesario:
root@ordenata:~$ apt-get install geotiff-bin

El comando más habitual es:

geotipcp -e archivo.tfw origen.tif destino.tif

Las instrucciones son:

usage: gtiffcp [options] input... output
where options are:
-g file install GeoTIFF metadata from <file>
-4 proj4_str install GeoTIFF metadata from proj4 string
-e file install positioning info from ESRI Worldfile <file>
-a append to output instead of overwriting
-o offset set initial directory offset
-p contig pack samples contiguously (e.g. RGBRGB...)
-p separate store samples separately (e.g. RRR...GGG...BBB...)
-s write output in strips
-t write output in tiles
-i ignore read errors
-d truncate 8 bitspersample to 4bitspersample

-r # make each strip have no more than # rows
-w # set output tile width (pixels)
-l # set output tile length (pixels)

-f lsb2msb force lsb-to-msb FillOrder for output
-f msb2lsb force msb-to-lsb FillOrder for output

-c lzw[:opts] compress output with Lempel-Ziv & Welch encoding
-c zip[:opts] compress output with deflate encoding
-c jpeg[:opts]compress output with JPEG encoding
-c packbits compress output with packbits encoding
-c g3[:opts] compress output with CCITT Group 3 encoding
-c g4 compress output with CCITT Group 4 encoding
-c none use no compression algorithm on output

Group 3 options:
1d use default CCITT Group 3 1D-encoding
2d use optional CCITT Group 3 2D-encoding
fill byte-align EOL codes
For example, -c g3:2d:fill to get G3-2D-encoded data with byte-aligned EOLs

JPEG options:
# set compression quality level (0-100, default 75)
r output color image as RGB rather than YCbCr
For example, -c jpeg:r:50 to get JPEG-encoded RGB data with 50% comp. quality

LZW and deflate options:
# set predictor value
For example, -c lzw:2 to get LZW-encoded data with horizontal differencing

Y un ejemplo de archivo.tfw sería:

0.0096628
0.00257495
0.00257495
-0.0096628
618251.334935
4849230.18706

es decir:


|Vx1, Vx2| es el tamaño del pixel en la dirección x
|Vy1, Vy2| es el tamaño del pixel en la dirección y
Px, Py son las coordenadas del punto de origen.

No hay comentarios:

Publicar un comentario