|
|
|
|
|
2.10.3 Data Volume
2.10.3.1 Product Sizes for Disk Storage
Approximate values of the worst case input,
intermediate, and output product sizes for
each of the ASAR products is shown below in
table 2.74 and table 2.75 below. The table is
taken from the processing system
specification, and users will be most
interested in the Output Data Set Size
column. The need for intermediate product
storage arises during the processing of geocoded products
|
Table 2.74 ASAR approximate image data disk requirements
|
|
Product Identifier
|
Input Data Set Size(MB)
|
Intermediate Data Set
Size(MB)
|
Output Data Set Size(MB)
|
Total(MB)
|
|
|
250
|
-
|
128
|
378
|
|
|
250
|
-
|
690
|
940
|
|
|
250
|
350
|
280
|
880
|
|
|
250
|
-
|
4
|
254
|
|
|
250
|
-
|
256
|
506
|
|
|
250
|
-
|
1380
|
1630
|
|
|
250
|
980
|
560
|
1790
|
|
|
250
|
-
|
8
|
258
|
|
|
800
|
-
|
60
|
860
|
|
|
740 /orbit
|
-
|
2070 / orbit
|
2810 / orbit
|
|
|
675 / orbit
|
-
|
140 / orbit
|
815 / orbit
|
The table assumes about 20 sec of raw data is
required to process both scene and stripline
products with 100 km coverage. 65 sec of
data is assumed to be needed for
products with 400 km coverage.
Wave mode processing for an
entire orbit has the largest disk space
requirements. The calculation of the data
set sizes for each imagette in Wave Mode are
detailed below.
|
Table 2.75 Data sizes for wave mode imagette
|
|
|
Ka |
PRF(max)
|
Azimuth matched filter
length La
|
Number of samples per range
line (max) Nr
|
Range matched filter length
(min) Lr
|
Number echoes per imagette
(max) Na
|
Input data set size(MB)Nr*
Na/ 2
|
Output data set
size(MB)(Nr-Lr)*(Na-La)*4
|
|
IS1
|
1969 |
1677
|
1143
|
1164
|
287
|
2392
|
1.33
|
4.18
|
|
IS2
|
1929 |
1645
|
1122
|
1223
|
292
|
2376
|
1.38
|
4.45
|
|
IS3
|
1859 |
2095
|
1889
|
1079
|
226
|
3080
|
1.58
|
3.88
|
|
IS4
|
1789 |
1680
|
1262
|
1305
|
286
|
2520
|
1.56
|
4.89
|
|
IS5
|
1727 |
2082
|
2008
|
1161
|
231
|
3160
|
1.74
|
4.09
|
|
IS6
|
1671 |
1698
|
1380
|
1352
|
283
|
2648
|
1.71
|
5.17
|
|
IS7
|
1619 |
2070
|
2117
|
1215
|
232
|
3192
|
1.85
|
4.03
|
|
|
|
|
| |
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,
atmospheric chemistry
|
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