<?xml version='1.0' encoding='ISO-8859-1' standalone='yes' ?>
	<help>
		<element name="DESCRIPTION" text="This algorithm calculates the Perpendicular Vegetation Index (PVI) (Richardson and Wiegand, 1977). The PVI uses the perpendicular distance from each pixel from the soil line according to how it is shown in the following figure: " description="Description" type="0">
		</element>
		<element name="ADDITIONAL_INFO" text="* A.J. Richardson and C.L. Wiegand. Distinguishing vegetation from background soil information. Photogrammetric Engineering and Remote Sensing, 43:1541-1552, 1977." description="Additional information" type="0">
		</element>
		<element name="EXTENSION_AUTHOR" text="Victor Olaya" description="Extension created by" type="0">
		</element>
		<element name="HELP_AUTHOR" text="Victor Olaya" description="Help file created by" type="0">
		</element>
		<element name="USER_NOTES" text="" description="User_notes" type="0">
		</element>
		<element name="LAYERRED" text="select the raster layer with the red band values." description="Red layer" type="3">
		</element>
		<element name="BANDRED" text="select the red band." description="Red band" type="3">
		</element>
		<element name="LAYERNIR" text="select the raster layer with the near-infrared values." description="Near infrarred layer" type="3">
		</element>
		<element name="BANDNIR" text="select the infrared band." description="Near infrarred layer" type="3">
		</element>
		<element name="SLOPE" text="value of line slope that relationship between the slope b and point a intercept parameters, or, relationship between the near-infrared (NIR) and red (R) reflectante of bare soil characterized by slope. The following graphic show soil line slope where you can see relationship between NIR and R image instensity of bare soil or reflectance." description="Soil line slope" type="3">
			<image description="" file="linea_suelo.png">
			</image>
		</element>
		<element name="INTERCEPT" text="value of vertical distance from point to axis X." description="Soil line intercept" type="3">
		</element>
		<element name="OUTPUT_DESCRIPTION" text="" description="Description" type="2">
		</element>
		<element name="RESULT" text="New raster layer." description="Result" type="2">
		</element>
	</help>
<?xml version='1.0' encoding='ISO-8859-1' standalone='yes' ?>