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24.2.5. Raster projections

24.2.5.1. Priskirti projekciją

Applies a coordinate system to a raster dataset.

This algorithm is derived from the GDAL edit utility.

Default menu: Raster ► Projections

Parametrai

Užrašas	Pavadinimas	Tipas	Aprašymas
Įvesties sluoksnis	INPUT_LAYER	[raster]	Input raster layer
Desired CRS	CRS	[crs]	The projection (CRS) of the output layer

Išvestys

Užrašas	Pavadinimas	Tipas	Aprašymas
Layer with projection	OUTPUT	[raster]	The output raster layer (with the new projection information)

Pythono kodas

Algorithm ID: gdal:assignprojection

import processing
processing.run("algorithm_id", {parameter_dictionary})

algoritmo id rodomas, kai užvedate pelę virš algoritmo apdorojimo įrankinėje. parametrų žodynas teikia parametrų pavadinimus ir reikšmes. Daugiau informacijos apie tai, kaip vykdyti apdorojimo algoritmus Pythono konsolėje rasite skyriuje Using processing algorithms from the console.

24.2.5.2. Extract projection

Extracts the projection of a raster file and writes it into a world file with extension .wld.

This algorithm is derived from the GDAL srsinfo utility.

Default menu: Raster ► Projections

Parametrai

Užrašas	Pavadinimas	Tipas	Aprašymas
Input file	INPUT_LAYER	[raster]	Input raster The raster layer has to be file based, as the algorithm uses the path to the raster file as the location of the generated .wld file. Using a non-file raster layer will lead to an error.
Create also .prj file	PRJ_FILE_CREATE	[boolean] Numatytas: ne	If this is activated a .prj file containing the projection information is also created.

Išvestys

Užrašas	Pavadinimas	Tipas	Aprašymas
World file	WORLD_FILE	[file]	Text file with extension .wld containing transformation parameters for the raster file.
ESRI Shapefile prj file	PRJ_FILE	[file]	Text file with .prj extension that describes the CRS. Will be None if Create also .prj file is False.

Pythono kodas

Algorithm ID: gdal:extractprojection

import processing
processing.run("algorithm_id", {parameter_dictionary})

algoritmo id rodomas, kai užvedate pelę virš algoritmo apdorojimo įrankinėje. parametrų žodynas teikia parametrų pavadinimus ir reikšmes. Daugiau informacijos apie tai, kaip vykdyti apdorojimo algoritmus Pythono konsolėje rasite skyriuje Using processing algorithms from the console.

24.2.5.3. Warp (reproject)

Reprojects a raster layer into another Coordinate Reference System (CRS). The output file resolution and the resampling method can be chosen.

This algorithm is derived from the GDAL warp utility.

Default menu: Raster ► Projections

Parametrai

Baziniai parametrai

Užrašas	Pavadinimas	Tipas	Aprašymas
Įvesties sluoksnis	INPUT	[raster]	Input raster layer to reproject
Source CRS Pasirinktinis	SOURCE_CRS	[crs]	Defines the CRS of the input raster layer
Target CRS Pasirinktinis	TARGET_CRS	[crs] Default: EPSG:4326	The CRS of the output layer
Resampling method to use	RESAMPLING	[sąrašas] Numatytas: 0	Pixel value resampling method to use. Options: 0 — Nearest Neighbour 1 — Bilinear (2x2 kernel) 2 — Cubic (4x4 kernel) 3 — Cubic B-Spline (4x4 kernel) 4 — Lanczos (6x6 kernel) 5 — Average 6 — Mode 7 — Maximum 8 — Minimum 9 — Median 10 — First quartile (Q1) 11 — Third quartile (Q3)
NoData value for output bands Pasirinktinis	NODATA	[number: double] Default: Not set	Sets NoData value for output bands. If not provided, then NoData values will be copied from the source dataset.
Output file resolution in target georeferenced units Pasirinktinis	TARGET_RESOLUTION	[number: double] Default: Not set	Defines the output file resolution of reprojection result
Reprojected	OUTPUT	[raster] Numatytas: [Įrašyti į laikiną failą]	Specification of the output raster layer. One of: Įrašyti į laikiną failą Įrašyti į failą…

Advanced parameters

Užrašas	Pavadinimas	Tipas	Aprašymas
Additional creation options Pasirinktinis	OPTIONS	[string] Default: ‚‘	For adding one or more creation options that control the raster to be created (colors, block size, file compression…). For convenience, you can rely on predefined profiles (see GDAL driver options section). Batch Process and Model Designer: separate multiple options with a pipe character (|).
Output data type	DATA_TYPE	[sąrašas] Numatytas: 0	Defines the format of the output raster file. Options: 0 — Use Input Layer Data Type 1 — Byte (Eight bit unsigned integer (quint8)) 2 — Int16 (Sixteen bit signed integer (qint16)) 3 — UInt16 (Sixteen bit unsigned integer (quint16)) 4 — UInt32 (Thirty two bit unsigned integer (quint32)) 5 — Int32 (Thirty two bit signed integer (qint32)) 6 — Float32 (Thirty two bit floating point (float)) 7 — Float64 (Sixty four bit floating point (double)) 8 — CInt16 (Complex Int16) 9 — CInt32 (Complex Int32) 10 — CFloat32 (Complex Float32) 11 — CFloat64 (Complex Float64) 12 — Int8 (Eight bit signed integer (qint8)) Available options depend on the GDAL version built with QGIS (see Help ► About menu)
Georeferenced extents of output file to be created Pasirinktinis	TARGET_EXTENT	[extent]	Sets the georeferenced extent of the output file to be created (in the Target CRS by default. In the CRS of the target raster extent, if specified). Available methods are: Calculate from layer…: uses extent of a layer loaded in the current project Calculate from layout map…: uses extent of a layout map item in the active project Calculate from bookmark…: uses extent of a saved bookmark Use map canvas extent Draw on canvas: click and drag a rectangle delimiting the area to take into account Enter the coordinates as xmin, xmax, ymin, ymax
CRS of the target raster extent Pasirinktinis	TARGET_EXTENT_CRS	[crs]	Specifies the CRS in which to interpret the coordinates given for the extent of the output file. This must not be confused with the target CRS of the output dataset. It is instead a convenience e.g. when knowing the output coordinates in a geodetic long/lat CRS, but wanting a result in a projected coordinate system.
Use multithreaded warping implementation	MULTITHREADING	[boolean] Numatytas: ne	Two threads will be used to process chunks of the image and perform input/output operations simultaneously. Note that the computation itself is not multithreaded.
Additional command-line parameters Pasirinktinis	EXTRA	[string] Default: Not set	Add extra GDAL command line options.

Išvestys

Užrašas	Pavadinimas	Tipas	Aprašymas
Reprojected	OUTPUT	[raster] Numatytas: [Įrašyti į laikiną failą]	Reprojected output raster layer

Pythono kodas

Algorithm ID: gdal:warpreproject

import processing
processing.run("algorithm_id", {parameter_dictionary})

algoritmo id rodomas, kai užvedate pelę virš algoritmo apdorojimo įrankinėje. parametrų žodynas teikia parametrų pavadinimus ir reikšmes. Daugiau informacijos apie tai, kaip vykdyti apdorojimo algoritmus Pythono konsolėje rasite skyriuje Using processing algorithms from the console.