ST_SetBandIsNoData
戻る  11.8. ラスタバンドエディタ  次へ

名前

ST_SetBandIsNoData — バンドのisnodataフラグをTRUEにします。

概要

raster ST_SetBandIsNoData(raster rast, integer band=1);

説明

バンドのisnodataフラグをTRUEにします。バンドを指定しない場合には、1番と仮定します。isnodataフラグが汚れている場合にのみ呼ぶべきものです。ST_BandIsNoDataの、最後の引数にTRUEを設定した場合の結果と指定しない場合の結果とで異なっている時です。

Availability: 2.0.0

例

This example creates a dummy table with one raster column. The raster has two bands and one pixel per band. In the first band, the NODATA value and pixel value are both 3. In the second band, the NODATA value is 13 and the pixel value is 4.

Code
create table dummy_rast (rid integer, rast raster);

insert into dummy_rast values(
1,
(
'01' -- little endian (uint8 ndr)
||
'0000' -- version (uint16 0)
||
'0200' -- nBands (uint16 0)
||
'17263529ED684A3F' -- scaleX (float64 0.000805965234044584)
||
'F9253529ED684ABF' -- scaleY (float64 -0.00080596523404458)
||
'1C9F33CE69E352C0' -- ipX (float64 -75.5533328537098)
||
'718F0E9A27A44840' -- ipY (float64 49.2824585505576)
||
'ED50EB853EC32B3F' -- skewX (float64 0.000211812383858707)
||
'7550EB853EC32B3F' -- skewY (float64 0.000211812383858704)
||
'E6100000' -- SRID (int32 4326)
||
'0100' -- width (uint16 1)
||
'0100' -- height (uint16 1)
||
'4' -- hasnodatavalue set to true, isnodata value set to false (when it should be true)
||
'2' -- first band type (4BUI)
||
'03' -- novalue==3
||
'03' -- pixel(0,0)==3 (same that nodata)
||
'0' -- hasnodatavalue set to false
||
'5' -- second band type (16BSI)
||
'0D00' -- novalue==13
||
'0400' -- pixel(0,0)==4
)::raster
);

select ST_BandIsNoData(rast, 1) from dummy_rast where rid = 1; -- Expected false
select ST_BandIsNoData(rast, 1, TRUE) from dummy_rast where rid = 1; -- Expected true

The isnodata flag is dirty, so set it to true.

Code
update dummy_rast set rast = ST_SetBandIsNoData(rast, 1) where rid = 1;


select ST_BandIsNoData(rast, 1) from dummy_rast where rid = 1; -- Expected true