[GRASS-dev] GRASS_COMPRESSOR=BZIP2 in winGRASS
Helmut Kudrnovsky
hellik at web.de
Mon Sep 19 12:49:46 PDT 2016
Helmut Kudrnovsky wrote
> Hi,
>
>>2016-09-18 20:04 GMT+02:00 Markus Neteler <
> neteler@
> >:
>>>> "GRASS needs to be compiled with BZIP2 for BZIP2 compression"
>>>> ?
>>>
>>> I checked
>>> https://wingrass.fsv.cvut.cz/grass73/x86_64/logs/log-r69510-8/
>>> BZIP2 support: no
>>>
>>> That's why it is at time not included in winGRASS...
>>
>>bzlib2 support activated in trunk (r69517). Let's check the next
>>WinGRASS build. Martin
>
> tested with today's winGRASS daily:
> ---
> echo %GRASS_COMPRESSOR%
> BZIP2
>
> r.mapcalc expression=checkcompression = elevation at PERMANENT / 2
>
> r.compress -p map=checkcompression at checkbzip2
> <checkcompression>
> is compressed (method 4: BZIP2). Data type: FCELL
> ---
>
> thanks for activating BZIP2 compression.
some tests with different compressors:
r.info map=CHELSA_bio01 at chelsa_bioclim
+----------------------------------------------------------------------------+
| Map: CHELSA_bio01 at chelsa_bioclim Date: Mon Sep 19 21:21:59 2016
|
| Mapset: chelsa_bioclim Login of Creator: hkmyr
|
| Location: loc_epsg4326
|
| DataBase: D:\grassdata
|
| Title: CHELSA_bio01
|
| Timestamp: none
|
|----------------------------------------------------------------------------|
|
|
| Type of Map: raster Number of Categories: 0
|
| Data Type: FCELL
|
| Rows: 4920
|
| Columns: 8160
|
| Total Cells: 40147200
|
| Projection: Längen- und Breitengrad
|
| N: 73N S: 32N Res: 0:00:30
|
| E: 54E W: 14W Res: 0:00:30
|
| Range of data: min = -16.2343 max = 26.04194
|
|
|
| Data Description:
|
| generated by r.in.gdal
|
|
|
| Comments:
|
| r.in.gdal -k input="D:\gis_data_climate\chelsa\CHELSA_bio01_1979-201\
|
| 3_V1_1_eur.tif" output="CHELSA_bio01" memory=300 offset=0 num_digits=0
|
|
|
+----------------------------------------------------------------------------+
r.info map=CHELSA_bio02 at chelsa_bioclim
+----------------------------------------------------------------------------+
| Map: CHELSA_bio02 at chelsa_bioclim Date: Mon Sep 19 21:22:17 2016
|
| Mapset: chelsa_bioclim Login of Creator: hkmyr
|
| Location: loc_epsg4326
|
| DataBase: D:\grassdata
|
| Title: CHELSA_bio02
|
| Timestamp: none
|
|----------------------------------------------------------------------------|
|
|
| Type of Map: raster Number of Categories: 0
|
| Data Type: FCELL
|
| Rows: 4920
|
| Columns: 8160
|
| Total Cells: 40147200
|
| Projection: Längen- und Breitengrad
|
| N: 73N S: 32N Res: 0:00:30
|
| E: 54E W: 14W Res: 0:00:30
|
| Range of data: min = 6.353987 max = 27.25062
|
|
|
| Data Description:
|
| generated by r.in.gdal
|
|
|
| Comments:
|
| r.in.gdal -k input="D:\gis_data_climate\chelsa\CHELSA_bio02_1979-201\
|
| 3_V1_1_eur.tif" output="CHELSA_bio02" memory=300 offset=0 num_digits=0
|
|
|
+----------------------------------------------------------------------------+
r.info map=CHELSA_bio03 at chelsa_bioclim
+----------------------------------------------------------------------------+
| Map: CHELSA_bio03 at chelsa_bioclim Date: Mon Sep 19 21:22:35 2016
|
| Mapset: chelsa_bioclim Login of Creator: hkmyr
|
| Location: loc_epsg4326
|
| DataBase: D:\grassdata
|
| Title: CHELSA_bio03
|
| Timestamp: none
|
|----------------------------------------------------------------------------|
|
|
| Type of Map: raster Number of Categories: 0
|
| Data Type: FCELL
|
| Rows: 4920
|
| Columns: 8160
|
| Total Cells: 40147200
|
| Projection: Längen- und Breitengrad
|
| N: 73N S: 32N Res: 0:00:30
|
| E: 54E W: 14W Res: 0:00:30
|
| Range of data: min = 31.54294 max = 62.04853
|
|
|
| Data Description:
|
| generated by r.in.gdal
|
|
|
| Comments:
|
| r.in.gdal -k input="D:\gis_data_climate\chelsa\CHELSA_bio03_1979-201\
|
| 3_V1_1_eur.tif" output="CHELSA_bio03" memory=300 offset=0 num_digits=0
|
|
|
+----------------------------------------------------------------------------+
r.info map=CHELSA_bio04 at chelsa_bioclim
+----------------------------------------------------------------------------+
| Map: CHELSA_bio04 at chelsa_bioclim Date: Mon Sep 19 21:22:54 2016
|
| Mapset: chelsa_bioclim Login of Creator: hkmyr
|
| Location: loc_epsg4326
|
| DataBase: D:\grassdata
|
| Title: CHELSA_bio04
|
| Timestamp: none
|
|----------------------------------------------------------------------------|
|
|
| Type of Map: raster Number of Categories: 0
|
| Data Type: FCELL
|
| Rows: 4920
|
| Columns: 8160
|
| Total Cells: 40147200
|
| Projection: Längen- und Breitengrad
|
| N: 73N S: 32N Res: 0:00:30
|
| E: 54E W: 14W Res: 0:00:30
|
| Range of data: min = 216.0067 max = 1312.274
|
|
|
| Data Description:
|
| generated by r.in.gdal
|
|
|
| Comments:
|
| r.in.gdal -k input="D:\gis_data_climate\chelsa\CHELSA_bio04_1979-201\
|
| 3_V1_1_eur.tif" output="CHELSA_bio04" memory=300 offset=0 num_digits=0
|
|
|
+----------------------------------------------------------------------------+
---------
original geotif with gdal_translate -co COMPRESS=LZW -co PREDICTOR=2
ls -l
total 279600
-rw-r--r-- 1 88170601 Sep 19 19:07 CHELSA_bio01_1979-2013_V1_1_eur.tif
-rw-r--r-- 1 56511749 Sep 19 19:13 CHELSA_bio02_1979-2013_V1_1_eur.tif
-rw-r--r-- 1 69376203 Sep 19 19:16 CHELSA_bio03_1979-2013_V1_1_eur.tif
-rw-r--r-- 1 72247104 Sep 19 19:19 CHELSA_bio04_1979-2013_V1_1_eur.tif
---------
r.in.gdal and GRASS_COMPRESSOR=ZLIB
ls -l
total 305909
-rw-r--r-- 1 82287638 Sep 19 19:28 CHELSA_bio01_zlib
-rw-r--r-- 1 77139587 Sep 19 19:28 CHELSA_bio02_zlib
-rw-r--r-- 1 74791532 Sep 19 19:28 CHELSA_bio03_zlib
-rw-r--r-- 1 79030011 Sep 19 19:28 CHELSA_bio04_zlib
---------
r.in.gdal and GRASS_COMPRESSOR=BZIP2 and GRASS_INT_ZLIB=9
ls -l
total 311983
-rw-r--r-- 1 84163200 Sep 19 19:21 CHELSA_bio01
-rw-r--r-- 1 78882189 Sep 19 19:22 CHELSA_bio02
-rw-r--r-- 1 74892325 Sep 19 19:22 CHELSA_bio03
-rw-r--r-- 1 81530621 Sep 19 19:22 CHELSA_bio04
-----------
at least in this case of data, r.external to '-co COMPRESS=LZW -co
PREDICTOR=2' geotiffs saves more disk space than import (regardless of the
GRASS_COMPRESSOR).
-----
best regards
Helmut
--
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