[raster] ST_Sum

[Bborie Park]

This function calls ST_SummaryStats and only returns the sum from that function.

1. ST_Sum(rast raster, nband int, hasnodata boolean) -> double precision

returns the sum as an integer

nband: index of band

hasnodata: if FALSE, any pixel who's value is nodata is ignored

ST_Sum(rast, 1, FALSE)

2. ST_Sum(rast raster, nband int) -> double precision

assumes hasnodata = TRUE

ST_Sum(rast, 2)

3. ST_Sum(rast raster, hasnodata boolean) -> double precision

assumes nband = 1

ST_Sum(rast, TRUE)

4. ST_Sum(rast raster) -> double precision

assumes nband = 1 and hasnodata = TRUE

ST_Sum(rast)

The set of ST_ApproxSum functions are:

1. ST_ApproxSum(rast raster, nband int, hasnodata boolean, sample_percent double precision) -> double precision

sample_percent: a value between 0 and 1 indicating the percentage of the raster band's pixels to consider

ST_ApproxSum(rast, 3, FALSE, 0.1)

ST_ApproxSum(rast, 1, TRUE, 0.5)

2. ST_ApproxSum(rast raster, nband int, sample_percent double precision) -> double precision

assumes that nband = 1

ST_ApproxSum(rast, 2 0.01)

ST_ApproxSum(rast, 4, 0.025)

3. ST_ApproxSum(rast raster, hasnodata boolean, sample_percent double precision) -> double precision

assumes that nband = 1

ST_ApproxSum(rast, FALSE, 0.01)

ST_ApproxSum(rast, TRUE, 0.025)

4. ST_ApproxSum(rast raster, sample_percent double precision) -> double precision

assumes that nband = 1 and hasnodata = TRUE

ST_ApproxSum(rast, 0.25)

5. ST_ApproxSum(rast raster) -> double precision

assumes that nband = 1, hasnodata = TRUE and sample_percent = 0.1

ST_ApproxSum(rast)

The following functions are provided for coverage tables.

1. ST_Sum(rastertable text, rastercolumn text, nband int, hasnodata boolean) -> double precision

rastertable: name of table with raster column

rastercolumn: name of column of data type raster

ST_Sum('tmax_2010', 'rast', 1, FALSE)

ST_Sum('precip_2011', 'rast', 1, TRUE)

2. ST_Sum(rastertable text, rastercolumn text, nband int) -> double precision

hasnodata = TRUE

ST_Sum('tmax_2010', 'rast', 1)

3. ST_Sum(rastertable text, rastercolumn text, hasnodata boolean) -> double precision

nband = 1

ST_Sum('precip_2011', 'rast', TRUE)

4. ST_Sum(rastertable text, rastercolumn text) -> double precision

nband = 1 and hasnodata = TRUE

ST_Sum('tmin_2009', 'rast')

Variations for ST_ApproxSum are:

1. ST_ApproxSum(rastertable text, rastercolumn text, nband int, hasnodata boolean, sample_percent double precision) -> double precision

ST_ApproxSum('tmax_2010', 'rast', 1, FALSE, 0.5)

ST_ApproxSum('precip_2011', 'rast', 1, TRUE, 0.2)

2. ST_ApproxSum(rastertable text, rastercolumn text, nband int, sample_percent double precision) -> double precision

hasnodata = TRUE

ST_ApproxSum('tmax_2010', 'rast', 1, 0.5)

ST_ApproxSum('precip_2011', 'rast', 1, 0.2)

3. ST_ApproxSum(rastertable text, rastercolumn text, hasnodata boolean, sample_percent double precision) -> double precision

nband = 1

ST_ApproxSum('tmax_2010', 'rast', FALSE, 0.5)

ST_ApproxSum('precip_2011', 'rast', TRUE, 0.2)

4. ST_ApproxSum(rastertable text, rastercolumn text, sample_percent double precision) -> double precision

nband = 1 and hasnodata = TRUE

ST_ApproxSum('tmax_2010', 'rast', 0.5)

ST_ApproxSum('precip_2011', 'rast', 0.2)

5. ST_ApproxSum(rastertable text, rastercolumn text) -> double precision

nband = 1, hasnodata = TRUE and sample_percent = 0.1

ST_ApproxSum('tmax_2010', 'rast')

ST_ApproxSum('precip_2011', 'rast')

[Bborie Park]

Added in r7246.