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Using the Align Tool in MapInfo Pro Advanced

MapInfo Pro 17.0

The processing tool Align has been introduced in the MapInfo Pro 17.0 release to snap our raster data to overcome the data alignment problems that commonly occur when compiling data from various sources with different levels of quality assurance. The tool helps align a raster’s cell size, origin and projection with a primary raster file chosen as a reference.

To perform the align operation two raster files are required, the input raster that needs to be aligned and the primary raster that is used as reference. If the primary raster is a multi-field raster, the default behavior is that the input raster aligns with the first field and first band of the primary raster.

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Align tool dialog, click on Raster ribbon > Raster Operations > Align

The Align dialog has three basic categories: Input, Align Options and Output  

Input

Input File – Select or browse the raster file that needs to be aligned

Primary Raster -Select or browse the primary raster file for reference

 Align Options  

Override Cell Size: Use this option to override primary raster’s cell size and specify the desired cell size for the output raster.

Resample Methods: There are three interpolation methods available to resample the input raster files.

Nearest -This is the most common interpolation method in which the input raster data acquires the new cell value from the nearest cells since it does not alter the value of the input cells Once the location of the cell's center on the output raster dataset is located on the input raster, nearest neighbor assignment will determine the location of the closest cell center on the input raster and assign the value of that cell to the cell on the output raster.

Bilinear - Bilinear interpolation uses the value of the four nearest input cell centers to determine the value on the output raster. The new value for the output cell is a weighted average of these four values. This method is used for specific data sets like imagery or aerial photography.

Bicubic -This method is similar to the Bilinear interpolation but it resamples the data using large matrix. It uses the weighted value of 16 surrounding image cell values in the input raster to interpolate the value of a grid cell in the output raster. The images produced are smoother and with more accurate data.

Interpolate From Base: Check this option to interpolate input raster from the base level, if it is not selected nearest overview level will be used for interpolation for assigning the cell value. It is trade-off between accuracy and processing speed. 

Output

Output File: Edit the output file name or browse to save the output file in the system directory.

Output Setting -The output settings is generally controlled by the values set in the Raster Preferences, however, you can override before executing the operation.

Compression Settings -If the file format to be saved is an MRR or TIFF, the compression settings options will appear to choose one method from Data Balanced, Data Speed, Data Space or Advanced options as required.

Display Output File: Choose this option if the output raster in the mapper after the successful completion of the Align operation has to be displayed. We can configure to make this default behavior from the Raster Preferences dialog.


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The above images show the 2 Raster layers before and after the Align tool is used.

UPDATED:  May 2, 2018