Main menu

Pages

Edit post

Download Rasters, Generate Raster from Raster Function and Mosaic

Husam Jubeh
(0)

Download Rasters, Generate Raster from Raster Function and Mosaic Tools

Download Rasters

How to Download Rasters Tool in Arc Toolbox ArcMap ArcGIS??

Download Rasters Tool
Download Rasters

Path to access the tool

:

Download Rasters Tool, Raster Dataset Toolset, Raster Box, Data Management Tools Toolbox

 

Download Rasters

Downloads the source files from an image service or mosaic dataset.

1.    Input Image Service

The image service or mosaic dataset to download.

2.    Output Folder

The destination for the image service or mosaic dataset.

3.    Expression (optional)

An SQL expression to limit the download to raster datasets that satisfy the expression.

4.    Selection Feature (optional)

Limits the download to an extent of a feature class or bounding box. All raster datasets that intersect the extent will be downloaded.

5.    Clipping Using Selection Feature (optional)

Specify if you want to clip the downloaded images based on the geometry of a feature. Any raster that intersects the clipping geometry will be clipped and then downloaded. This is useful when your area of interest is not a rectangle. When downloaded images are clipped, you need to specify an output format for the clipped images.

  1. Unchecked—The files will be clipped based on the minimum bounding rectangle that has been specified. This is the default.
  2. Checked—The files will be clipped based on the geometry of the Selection Feature.

6.    Convert Rasters (optional)

Choose whether to always convert your rasters to the specified format, or to only convert when it is necessary.

  1. Unchecked—Do not convert the raster datasets to a new format.
  2. Checked—Convert the downloaded raster datasets into another format. If you used Selection Feature to limit the extent, then you need to specify a format in the Output Format parameter.

7.    Output Format (optional)

Choose a output format for the downloaded raster datasets.

  1. TIFF—Tagged Image File Format. This is the default.
  2. BIL—Esri band interleaved by line.
  3. BSQ—Esri band sequential.
  4. BIP—Esri band interleaved by pixel.
  5. BMP—Bitmap.
  6. ENVI—ENVI DAT file.
  7. IMAGINE Image—ERDAS IMAGINE.
  8. JPEG—Joint Photographics Experts Group. If chosen, you can also specify the compression quality. The valid compression quality value ranges are from 0 to 100.
  9. GIF—Graphic interchange format.
  10. JP2 —JPEG 2000. If chosen, you can also specify the compression quality. The valid compression quality value ranges are from 0 to 100.
  11. PNG—Portable Network Graphics.

8.    Compression Method (optional)

Choose the compression method to use with the specified Output Format.

NONE—No compression will occur. This is the default.

JPEG—Lossy compression that uses the public JPEG compression algorithm. If you choose JPEG, you can also specify the compression quality. The valid compression quality value ranges are from 0 to 100. This compression can be used for JPEG files and TIFF files.

  1. LZW—Lossless compression that preserves all raster cell values.
  2. PACKBITS—PackBits compression for TIFF files.
  3. RLE—Run-length encoding for IMG files.
  4. CCITT_GROUP3—Lossless compression for 1-bit data.
  5. CCITT_GROUP4—Lossless compression for 1-bit data.
  6. CCITT_1D—Lossless compression for 1-bit data.

9.    Compression Quality (optional)

Set a value from 1 - 100. Higher values will have better image quality, but less compression.

10. Maintain Folder Structure (optional)

Determines the folder structure of the downloaded rasters.

  1. Checked—replicates the hierarchical folder structure used to store the source raster datasets.
  2. Unchecked—raster datasets will be downloaded into the output folder as a flat folder structure

Generate Raster from Raster Function

How to Generate Raster from Raster Function Tool in Arc Toolbox ArcMap ArcGIS??

Generate Raster from Raster Function Tool
Generate Raster from Raster Function

Path to access the tool

:

Generate Raster from Raster Function Tool, Raster Dataset Toolset, Raster Box, Data Management Tools Toolbox

 

Generate Raster from Raster Function

Generates a raster dataset from an input raster function or function chain.

1.    Input Raster Function

The name of a raster function, raster function JSON object, or function chain (in .rft.xml format).

2.    Output Raster Dataset

The output raster dataset.

3.    Raster Function Arguments (optional)

The parameters associated with the function chain. For example, if the function chain applies the Hillshade raster function, set the data source, azimuth, and altitude.

4.    Raster Properties (optional)

The output raster dataset key properties, such as the sensor or wavelength.

5.    Format (optional)

The output format.

The default format will be derived from the file extension that was specified in the Output Raster Dataset.

  1. TIFF—Tagged Image File Format for raster datasets
  2. IMAGINE Image—ERDAS IMAGINE raster data format
  3. Esri Grid—Esri Grid raster dataset format
  4. CRF—Cloud Raster Format
  5. MRF—Meta Raster Format

Mosaic

How to Mosaic Tool in Arc Toolbox ArcMap ArcGIS??

Mosaic Tool
Mosaic Tool

Path to access the tool

:

Mosaic Tool, Raster Dataset Toolset, Raster Box, Data Management Tools Toolbox

 

Mosaic

Merges multiple existing raster datasets into an existing raster dataset.

1.    Input Rasters

The raster datasets you want to merge together.

2.    Target Raster

The raster to add the input rasters. This raster dataset must already exist. By default, the target raster is considered the first raster in the list of input raster datasets. You can create an empty raster using the Create Raster Dataset tool.

3.    Mosaic Operator (optional)

The method used to mosaic overlapping areas.

  1. FIRST—The output cell value of the overlapping areas will be the value from the first raster dataset mosaicked into that location.
  2. LAST—The output cell value of the overlapping areas will be the value from the last raster dataset mosaicked into that location. This is the default.
  3. BLEND—The output cell value of the overlapping areas will be a horizontally weighted calculation of the values of the cells in the overlapping area.
  4. MEAN—The output cell value of the overlapping areas will be the average value of the overlapping cells.
  5. MINIMUM—The output cell value of the overlapping areas will be the minimum value of the overlapping cells.
  6. MAXIMUM—The output cell value of the overlapping areas will be the maximum value of the overlapping cells.
  7. SUM—The output cell value of the overlapping areas will be the total sum of the overlapping cells.

For more information about each mosaic operator, refer to the Mosaic Operator help topic.

4.    Mosaic Colormap Mode (optional)

The method used to choose which color map from the input rasters will be applied to the mosaic output.

  1. FIRST—The color map from the first raster dataset in the list will be applied to the output raster mosaic. This is the default.
  2. LAST—The color map from the last raster dataset in the list will be applied to the output raster mosaic.
  3. MATCH—Will take all the color maps into consideration when mosaicking. If all possible values are already used (for the bit depth), it will attempt to match the value with the closest color that is available.
  4. REJECT—Only the raster datasets that do not have a color map associated with them will be mosaicked.

For more information about each colormap mode, refer to the Mosaic colormap mode help topic.

5.    Ignore Background Value (optional)

Use this option to remove the unwanted values created around the raster data. The value specified will be distinguished from other valuable data in the raster dataset. For example, a value of zero along the raster dataset's borders will be distinguished from zero values in the raster dataset.

The pixel value specified will be set to NoData in the output raster dataset.

For file-based rasters and geodatabase rasters, the Ignore Background Value must be set to the same value as NoData for the background value to be ignored. Enterprise geodatabase rasters will work without this extra step.

6.    NoData Value (optional)

All the pixels with the specified value will be set to NoData in the output raster dataset.

7.    Convert 1 bit data to 8 bit (optional)

Choose whether the input 1-bit raster dataset will be converted to an 8-bit raster dataset. In this conversion, the value 1 in the input raster dataset will be changed to 255 in the output raster dataset. This is useful when importing a 1-bit raster dataset to a geodatabase. One-bit raster datasets have 8-bit pyramid layers when stored in a file system, but in a geodatabase, 1-bit raster datasets can only have 1-bit pyramid layers, which makes the display unpleasant. By converting the data to 8 bit in a geodatabase, the pyramid layers are built as 8 bit instead of 1 bit, resulting in a proper raster dataset in the display.

  1. Unchecked—No conversion will be done. This is the default.
  2. Checked—The input raster will be converted.

8.    Mosaicking Tolerance (optional)

When mosaicking takes place, the target and the source pixels do not always line up exactly. When there is a misalignment of pixels, a decision needs to be made whether resampling takes place or whether the data should be shifted. The mosaicking tolerance controls whether resampling of the pixels take place or if the pixels should be shifted.

If the difference in pixel alignment (of the incoming dataset and the target dataset) is greater than the tolerance, resampling will take place. If the difference in pixel alignment (of the incoming dataset and the target dataset) is less than the tolerance, resampling will not take place (instead, a shift is performed).

The unit of tolerance is a pixel, where the valid value range is 0 to 0.5. A tolerance of 0.5 will guarantee a shift takes place. A tolerance of zero guarantees resampling, if there is a misalignment in pixels.

For example, the source and target pixels have a misalignment of 0.25. If the mosaicking tolerance is set to 0.2, then resampling will take place since the pixel misalignment is greater than the tolerance. If the mosaicking tolerance is set to 0.3, then the pixels will be shifted.

9.    Color Matching Method (optional)

Choose the color matching method to apply to the rasters.

  1. NONE—This option will not use the color matching operation when mosaicking your raster datasets.
  2. STATISTIC_MATCHING—This method will use descriptive statistics from the overlapping areas; the transformation will then be applied to the entire target dataset.
  3. HISTOGRAM_MATCHING—This method will match the histogram from the reference overlap area to the source overlap area; the transformation will then be applied to the entire target dataset.
  4. LINEARCORRELATION_MATCHING—This method will match overlapping pixels and interpolate the rest of the source dataset; pixels without a one-to-one relationship will use a weighted average.

Latest articles from : Data Management

Comments

Post a Comment

table of contents title