PipelineResampleToGeorefMulti.sml

# PipelineResampleToGeorefMulti.sml
# Sample standalone script to demonstrate a simple image pipeline application:
# Reprojecting a series of source rasters with control-point georeference to 
# align their lines/columns with their coordinate reference system and maintain 
# their current cell size
# Script shows how to incorporate an image processing pipeline into a user-defined
# function that is iteratively called to process a series of grayscale rasters
# through the same processing steps, with each iteration producing a single
# output raster.
# 21 February 2008
# Randy Smith, MicroImages, Inc.
# Requires Version 2007:73 or later of the TNT products.
numeric err;										# error code returned
# error checking procedure
proc ReportError(numeric linenum, numeric err) {
	printf("FAILED -line: %d, error: %d\n", linenum, err);
	PopupError(err); 
	}
numeric i; 	# loop counter
##################################################################################
###################################  Procedures  #################################
# function to process input rasters through the resampling pipeline
func rsmpPipe(
	class RVC_OBJITEM inObjItem, 
	class RVC_OBJITEM outObjItem, 
	numeric count, 
	class STRINGLIST list) 
	{
	local class STRING imgName$ = list.GetString(count-1);
	printf("Processing source image %s\n", imgName$ );
	# PIPELINE SOURCE
	# set input raster as source
	local class IMAGE_PIPELINE_SOURCE_RVC source_In( inObjItem );
	err = source_In.Initialize();
	if (err < 0) 
		return -1;
	else
		printf("Pipeline source for %s initialized\n", imgName$);
	# CHECK THAT SOURCE HAS VALID COORDINATE REFERENCE SYSTEM
	local class IMAGE_PIPELINE_GEOREFERENCE sourceGeoref;
	sourceGeoref = source_In.GetGeoreference();
	# get coordinate reference system from the source georeference
	local class SR_COORDREFSYS crs;						# input raster's coordinate reference system
	crs = sourceGeoref.GetCRS();
	if (crs.IsDefined() == 0 or crs.IsLocal() ) {
		return 0;
		}
	else {
		printf("Coordinate reference system for source %s: %s\n", imgName$, crs.Name );
		# get line and column cell sizes from source's georeference
		local class POINT2D scaleIn;		# line and column cell sizes as x and y values of POINT2D
		local class POINT2D locIn;			# column and line location for which to obtain cell size
		locIn.x = source_In.GetTotalColumns() / 2;	# location at center of image
		locIn.y = source_In.GetTotalRows() / 2;
		sourceGeoref.ComputeScale(locIn, scaleIn, 1);	# cell sizes in meters
		printf("Source %s image cell sizes: line = %.2f m, col = %.2f m\n", imgName$, scaleIn.y, scaleIn.x);
		# PIPELINE FILTER to resample source image
		class IMAGE_PIPELINE_FILTER_RESAMPLE filter_rsmp(source_In, crs, scaleIn.y, scaleIn.x, "Nearest");
		err = filter_rsmp.Initialize();
		if (err < 0) 
			return -1;
		else
			printf("Resample filter for source %s initialized.\n", imgName$);
		# PIPELINE TARGET: set up the target for the pipeline
		class IMAGE_PIPELINE_TARGET_RVC target_rvc(filter_rsmp, outObjItem);
		target_rvc.SetCompression("DPCM", 0);
		err = target_rvc.Initialize();
		if (err < 0) 
			return -1;
		else
			printf("Pipeline target for image %s initialized.\n", imgName$);
		# EXECUTE pipeline process
		print("Processing...");
		target_rvc.Process();
		printf("Completed processing for image %s.\n\n", imgName$);
		return 1;
		}
	}
####################################################################################
#####################################  Main program  ###############################
clear();
# set context so script does not exit on error, allowing manual
# handling of errors.
_context.AbortOnError = 0;
# CHOOSE GEOREFERENCED INPUT RASTERS to be resampled.
class RVC_OBJITEM inObjItemList[];		# HASH of RVC_OBJITEMS for unknown number of input rasters to mosaic
numeric numInputs;
# DlgGetObjects populates an RVC_OBJITEM hash with the RVC_OBJITEM of each selected raster
DlgGetObjects("Choose georeferenced rasters to resample:", "Raster", inObjItemList, "ExistingOnly", 2);
numInputs = inObjItemList.GetNumItems();
printf("Processing %d input rasters.\n", numInputs);
# MAKE STRINGLIST OF LABELS FOR DIALOG PROMPTING FOR OUTPUT RASTERS
class STRINGLIST labelList;
for i = 1 to numInputs
	{
	labelList.AddToEnd( inObjItemList[i].GetDescriptor().GetShortName() );
	}
# CHOOSE OUTPUT RASTERS
# DlgGetObjectSet populates a hash of ObjItems for the output; the new raster will then be created
# by the TARGET_RVC with the desired compression.  The ObjectPath of the ObjItem is not
# valid until the output raster is actually created by the pipeline process.
class RVC_OBJITEM outObjItemList[];
DlgGetObjectSet("Choose rasters for resampled output", "Raster", labelList, outObjItemList, "NewOnly");
# LOOP THROUGH LISTS OF INPUT AND OUTPUT RVC_OBJITEMS TO RESAMPLE IMAGES 
for i = 1 to numInputs
	{
	# USER-DEFINED FUNCTION TO RESAMPLE AN IMAGE
	err = rsmpPipe(inObjItemList[i], outObjItemList[i], i, labelList);
	if (err == 0)	# invalid coordinate reference system for input
		printf("Source image %d has undefined or local coordinater reference system; \n no resampled raster was made.\n\n", i);
	else if (err < 0)
		ReportError(_context.CurrentLineNum, err);
	}
print("Done.");