## ISCCP On-Line Data Formats

Data is available for downloading on either EQ or SQ grids, and either IEEE floating point, scaled integer, or ASCII text format.

**EQ grid**

This is a 2.5 degree Equal Area grid, and is the grid on which the data is produced. The ISCCP equal-area grid contains 6596 grid boxes. 0 degrees latitude, 0 degrees longitude is a box corner. Boxes are numbered sequentially, beginning at the South Pole and the Greenwich Meridian, and proceeding eastward through the latitude zone, then northward to the next latitude zone.

**SQ grid**

This is a 2.5 degree Square latitude/longitude grid, and is usually used for display purposes. The grid is 144 x 72 (longitude x latitude) and has a total of 10368 boxes. 0 degrees latitude, 0 degrees longitude is a box corner. Longitude varies first, and begins at -180 degrees and proceeds eastward to +180 degrees. Latitude begins at -90 degrees and proceeds northward to +90 degrees.

**IEEE floating point format**

Data is written using the IEEE standard for floating-point representation.

**Scaled integer format**

Data is written as scaled integers. Scale factors used are:

- Cloud Amount: 10
- Cloud Top Pressure: 1
- Cloud Top Temperature: 10
- Cloud Optical Depth: 100
- Surface Temperature: 10
- Surface Reflectance: 1000

**ASCII text format**

Data is written 80 characters per record. Each record contains values for 8 grid boxes, each with a field width of 10 characters. The precision is 3 decimal places.

**File sizes**

- EQ grid, IEEE floating point: 26384 bytes
- EQ grid, Scaled integer: 26384 bytes
- EQ grid, ASCII text: 65960 bytes
- SQ grid, IEEE floating point: 41472 bytes
- SQ grid, Scaled integer: 41472 bytes
- SQ grid, ASCII text: 103680 bytes

### Surface Observations Cloud Climatology (SOBS)

**EQ grid**

This is a 2.5 degree Equal Area grid, and is the grid on which the data is produced. The SOBS equal-area grid contains 7290 grid boxes. 0 degrees latitude, 0 degrees longitude is a box corner. Boxes are numbered sequentially, beginning at the North Pole and the Greenwich Meridian, and proceeding eastward through the latitude zone, then southward to the next latitude zone.

**SQ grid**

This is a 2.5 degree Square latitude/longitude grid, and is used for display purposes. The grid is 144 x 72 (longitude x latitude) and has a total of 10368 boxes. 0 degrees latitude, 0 degrees longitude is a box corner. Longitude varies first, and begins at -180 degrees and proceeds eastward to +180 degrees. Latitude begins at -90 degrees and proceeds northward to +90 degrees.

**IEEE floating point format**

Data is written using the IEEE standard for floating-point representation.

**Scaled integer format**

Data is written as scaled integers. Scale factors used are:

- Land Fraction Area: 10
- Amount: 10
- Number of Observations: 1
- Phase of First Harmonic: 100
- Absolute Amplitude of Harmonic: 10
- Percent Variance by First Harmonic: 10
- Number of Synoptic Hours or Months: 100
- Average Number of Synoptic Hours or Months: 10
- Number of Years Contributing to Trends: 100
- Span of Years Contributing to Trends: 100
- Interannual Variation: 10
- Trend (change average/year): 10
- Uncertainty of Trend: 10

**ASCII text format**

Data is written 80 characters per record. Each record contains values for 8 grid boxes, each with a field width of 10 characters. The precision is 3 decimal places.

**File sizes**

- EQ grid, IEEE floating point: 29160 bytes
- EQ grid, Scaled integer: 29160 bytes
- EQ grid, ASCII text: 72900 bytes
- SQ grid, IEEE floating point: 41472 bytes
- SQ grid, Scaled integer: 41472 bytes
- SQ grid, ASCII text: 103680 bytes

D2 Monthly Means | SOBS Cloud Climatology | Cloud Data & Products