Raster Mosaic

Introduction

Combine two or more raster datasets into one dataset based on its geographic coordinate system.

e.g.:

Mosaic3 1
Figure 1

Mosaic3 2
Figure 2

Figure 1 shows the raster datasets that have no common parts. Figure 2 shows you how to mosaic the taster datasets that have overlaid parts.

Basic Steps

  1. Click Data Processing, Raster Mosaic.
  2. The Mosaic dialog box pops up.
  3. Add raster datasets.
  4. Raster dataset type: Grid and Image. But the two types cannot be mixed.

If you want to change the type, you must delete the added dataset first.

Instruction for Toolbar Button

  • AddDataButton1 Click Add, and select raster datasets.
  • RemoveButton Click Remove to remove datasets.
  • SelectAll Click Select All to select all datasets.
  • SelectInvert Click Select Inverse.
  • MoveUp Forward the dataset.
  • MoveDown Backward the dataset.
  • MovetoTop Top the dataset.
  • MovetoButtom Bottom the dataset.
  • Parameter settings.

Parameter Settings

Raster parameter settings

  • Overlay Area Values: Gets cell values, such as elevation, rainfall, etc. There are five approaches:

    • Same as First: The cell values for the first raster dataset.
    • Same as last: The cell values for the last raster dataset.
    • Max of All Datasets: The max cell value of the raster dataset.
    • Min of All Datasets: The min cell value of the raster dataset.
    • Mean of All Datasets: The mean cell value of the raster dataset.
  • Format: Sets the pixel type for the result dataset.

    • Same as First: The pixel format for the first raster dataset.
    • Same as Last: The pixel format for the last raster dataset.
    • Highest Precision: The pixel format of the raster dataset that has the highest precision.
    • Lowest Precision: The pixel format of the raster dataset that has the lowest precision.
    • Most Frequent: The pixel format of the raster datasets that have the most frequent.
  • Pixel Format: There are bit1, bit4, bit8, bit16, integer, long integer, float, double. See Pixel types of raster dataset.
  • NoValue Data: Set a value if the dataset is null.
  • Tolerance: Set the tolerance of the no value data.

Image parameter settings

  • Overlay Area Values: Gets cell values, including color value or color index. There are two approaches:

    • Same as First: The cell values for the first raster dataset.
    • Same as Last: The cell values for the last raster dataset.
    • Max of All Datasets: Get the max values of R, G, B
    • Min of All Datasets: Get the min values of R, G, B
    • Mean of All Datasets: Get the mean values of R, G, B
  • Format: Sets the pixel type for the result dataset. Notes: The pixel formats do not support the single and double float of image dataset mosaic.

    • Same as First: The pixel format for the first image dataset.
    • Same as Last: The pixel format for the last image dataset.
    • Highest Precision: The pixel format of the image dataset that has the highest precision.
    • Lowest Precision: The pixel format of the image dataset that has the highest precision.
    • Most Frequent: The pixel format of the image datasets that have the most frequent.
  • Pixel Format: There are Monochrome, 16-color, 256-color, true color, enhanced true color. See Pixel types of image dataset.
  • Background: If a cell is the same to this color, it will be treated as background color. In this case, the color will not join to operation.
  • Tolerance: Set the tolerance of the background color.

Result Dataset

  • Datasource: By default the datasource is the dataset to be mosaicked.
  • Dataset: The name of the result dataset.
  • Encoding: SGL, DCT, LZW, PNG, Compound. Default is None. See Dataset Compact Encoding.

Encoding for raster dataset:

Original Encoding Usable Encoding
1 Bit 4 Bit Single-byte Double-byte Integer Long integer Float Double
NONE LZW LZW LZW, SGL LZW, SGL LZW, SGL NONE LZW, SGL LZW, SGL
SGL LZW LZW SGL SGL SGL NONE SGL SGL
LZW LZW LZW LZW LZW LZW NONE LZW LZW

Encoding for image dataset:

Original Encoding Usable Encoding
Monochrome 16-color 256-color Color True color Enhanced color
NONE LZW, PNG LZW, PNG LZW, DCT, PNG, compound LZW, DCT, compound LZW, DCT, PNG, compound LZW, DCT, PNG, compound
LZW LZW LZW LZW LZW LZW LZW
DCT LZW LZW DCT DCT DCT DCT
PNG PNG PNG PNG DCT PNG PNG
Compound LZW LZW Compound Compound Compound Compound
  • Create Image Pyramid: To improve the view speed.
  • Parameter settings.

Set the extent of the result dataset.

  1. Click OK to perform.

The pixel formats do not support single and double floats of image dataset mosaic.