Feature Representation

In addition to the generic FME feature attributes that FME Workbench adds to all features (see About Feature Attributes), this format adds the format-specific attributes described in this section.

NGrid features specify a matrix of x, y, and z coordinates.

Attribute Name

Contents

ngrid_type

This will always be ngrid_raster.

ngrid_rasterID

A number that specifies the identification number for each raster.

ngrid_tableName

A string that specifies the name of the MapInfo TAB header file associated with each raster file.

ngrid_coordSys

This attribute has been deprecated.

A string that specifies the MapInfo CoordSys coordinate system of each raster.

ngrid_coordSysName

This attribute has been deprecated.

A string that specifies the CoordSys Name as seen in a MapInfo CoordSys string.

ngrid_rasterDesc

A string that specifies a description of the raster and its data.

ngrid_XYUnitName

This attribute has been deprecated.

A string that specifies the name for the type of units used in the X and Y dimensions of the raster.

Range: Any valid MapInfo coordinate string unit name

ngrid_coordUnits

This attribute has been deprecated.

A number that specifies the units used in the X and Y dimensions of the raster, stored as a MapInfo unit value.

Range:

miles|kilometers|inches|feet|yards|

millimeters|centimeters|meters|

survey_ft|nauticalmiles|links|chains|

rods|degrees|user|dB|

dBm|dBW|dBuV_m|rad|microsec

ngrid_rasterVersion

A number that specifies the current version of each NGrid raster.

Default: 2.0

ngrid_displayStatus

A number whose bits specify the display properties of each raster.

Range: One byte

Default: 0

ngrid_datatype

Specifies the data type for surface (non-paletted) NGrid files. The REAL16 data type is less precise but may have better compatibility with viewing applications.

Range:REAL16|REAL32

Default:REAL32

ngrid_reserve1

A reserved value.

ngrid_reserve2

A reserved value.

ngrid_rasterModified

A number that specifies whether the raster has been modified.

Range: 0|1

Default: 0

ngrid_colorStructures

A number that specifies a pointer to the color structures in the NGrid raster handler.

Default: 0

ngrid_GRDZMin

A number that specifies the minimum value for the elevation data in each raster. (Valid only for continuous rasters)

ngrid_GRDZMax

A number that specifies the maximum value for the elevation data in each raster. (Valid only for continuous rasters)

ngrid_GRDZUnitType

A number that specifies the unit type of the coordinate system of the Z dimension of each raster. (Valid only for continuous rasters)

ngrid_GRDZUnits

A string that specifies the name of the coordinate system name of the Z dimension of each raster. (Valid only for continuous rasters)

ngrid_GRDlightAzimuth

A number that specifies the azimuth of light for each raster. (Valid only for continuous rasters)

Range: Any real number between 0 and 360

ngrid_GRDlightAngle

A number that specifies the angle of light for each raster. (Valid only for continuous rasters)

Range: Any real number between 0 and 360

ngrid_GRDoptFlag

A number whose bits specify the continuous raster options. (Valid only for continuous rasters)

Range: One byte

ngrid_GRDoptMask

A number whose bits specify the a mask for the ngrid_GRDoptFlag value. (Valid only for continuous rasters)

Range: One byte

ngrid_GRDHSBrightness

A number that specifies the brightness of hill-shading for each raster. (Valid only for continuous rasters)

Range: 0 to 255

ngrid_GRDHSContrast

A number that specifies the contrast of hill-shading for each raster. (Valid only for continuous rasters)

Range: 0 to 255

ngrid_GRDnumInflectPts

A number that specifies how many valid inflection points there are for each raster. (Valid only for continuous rasters)

Range: 0 to 64

ngrid_InflectionPt_ZValue

A number that specifies the Z dimension value (elevation) of the inflection points of each raster. (Valid only for continuous rasters)

Range: Between ngrid_GRDZMin and ngrid_GRDZMax

ngrid_InflectionPt_Red

A number that specifies the red component of the color of the inflection points of each raster. (Valid only for continuous rasters)

Range: 0 to 255

ngrid_InflectionPt_Green

A number that specifies the green component of the color of the inflection points of each raster. (Valid only for continuous rasters)

Range: 0 to 255

ngrid_InflectionPt_Blue

A number that specifies the blue component of the color of the inflection points of each raster. (Valid only for continuous rasters)

Range: 0 to 255

ngrid_HistZMin

A number that specifies the minimum value in the Z dimension (elevation) of the histogram for each raster. (Valid only for continuous rasters)

ngrid_HistZMax

A number that specifies the maximum value in the Z dimension (elevation) of the histogram for each raster. (Valid only for continuous rasters)

ngrid_HistNumNonNull

A number that specifies the number of Z dimension values (elevations) in each raster that are not null values. (Valid only for continuous rasters)

Range: 0 up to the total number of raster elements

ngrid_HistNumValues

A number that specifies the number of values in the histogram for each raster. (Valid only for continuous rasters)

Range: 0 to 65536

ngrid_HistData

A number that specifies a pointer to values in the histogram for each raster. (Valid only for continuous rasters)