IEEE Geoscience and Remote Sensing Magazine - December 2020 - 26

TABLE 3. THE CCD IMAGING DETAILS.
BANDS

SPECTRAL
RANGE (µM)

AT-NADIR
RESOLUTION (KM)

OFF-NADIR .
RESOLUTION (KM)

IMAGE SIZE

MAIN OBJECTIVES

Visible

0.62-0.68

1×1

3.5 × 3.5

6,518 × 7,164

Generation of vegetation index

Near IR

0.77-0.86

1×1

3.5 × 3.5

6,518 × 7,164

Generation of vegetation index

Short-wave IR

1.55-1.69

1×1

3.5 × 3.5

6,518 × 7,164

Snow and clouds discrimination

Table courtesy of SAC (ISRO), India.

TABLE 4. THE INSAT-3A VHRR DATA STATISTICS.
YEAR

2003-2008

Data reception

Full frame mode: at synoptic hours, i.e., three hours; normal frame mode: three triplets (00, 06, and 12 UTC) at half hour

Data volume per day

Total data = 3,036 Mb, raw data = 1,902 Mb, processed data = 1,050 Mb, and images in JPEG = 84 Mb

YEAR

2009-2016

Data reception

Normal frame mode: at hourly interval

Data volume per day

Total data = 5,976 Mb, raw data = 4,032 Mb, processed data = 1,800 Mb, and images in JPEG = 144 Mb

Data transmission
rate

526.5 kb/s

Data archival

All processed data in HDF format and images in JPEG format were archived until decommissioning. No raw data were
archived.

Users

Forecasters in real time for weather forecasting, nowcasting, and cyclone monitoring. Researchers for various studies.

Remarks

IR channels had a lot of noise, so IR images and wind vector data were not good quality.

Table courtesy of IMD, India.

TABLE 5. THE INSAT-3A CCD DATA STATISTICS.
YEAR

2003-2016

Data reception

Normal frame mode: six times a day on 03, 05, 06, 07, 09, 11, and 12 UTC

Data volume per day

Total data = 7,698 Mb, raw data = 2,048 Mb, processed data = 5,632 Mb, and images in JPEG = 18 Mb

Data transmission rate

526.5 kb/s

Data archival

All processed data in HDF format and images in JPEG format were archived until decommissioning. No raw data were
archived.

Users

Forecasters in real time for weather forecasting, nowcasting, and cyclone monitoring. Researchers for various studies.

Remarks

Extensively used for agricultural forecasting and studies.

Table courtesy of IMD, India.

Image Data
From Satellite

Data
Acquisition
System

Data
Reception
System

DPS

Earth Station
Data Products
FIGURE 2. A block diagram of the data reception and processing system deployed at SAC (ISRO).

26

IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE

DECEMBER 2020



IEEE Geoscience and Remote Sensing Magazine - December 2020

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