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¿Cómo encontrar una celda en un ráster con un valor específico y hacer zoom a ella?

TedRakel

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He procesado algunos datos LiDAR para crear una imagen .TIF de altura del dosel. Cuando veo la altura del dosel en arc map, en la tabla de contenidos, dice que el rango es de -20 a 61. Tengo curiosidad por saber dónde están los datos que están por debajo de cero, especialmente donde es -20. ¿Hay alguna manera de consultar la imagen y encontrar lugares donde el valor del píxel sea inferior a cero y luego hacer zoom a esa ubicación en el mapa?<\/P>

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Accepted answers

XanderBakker

When you have a large number of rows and columns, the classification might not visualize isolated pixels that have the negative canopy height. As an alternative you could use the Extract By Attributes tool (SA) to extract the pixels that you are interested in followed by Raster to Point (Conversion) to create a point featureclass with a point in the pixels you're interested in.

All comments

SepheFox

Well, you could symbolize your lidar using classified, and then manually change the classification so that the first class is -20-0, and then examine the raster for that class visually.

XanderBakker

StefanieSteinbach

You could also just use the tool Data management tools > Raster > Raster properties > Calculate raster attribute table to get a table for your raster. Since you are working with integers (?) this should do the trick. You can now open the table, sort the table entries by value and select all sub-zero values.

XanderBakker

I would assume that the canopy height based on LiDAR to be floating, but true if the data is integer you could do this, but still single isolated pixels will be hard to spot is the extent (rows x cols) is big. It might be displaying pyramids not showing those isolated pixels.

TedRakel

Thanks for your help.. My raster image is a TIF and it stores float values, so I couldn't use the Data management tools > Raster > Raster properties > Calculate raster attribute table tool. I was able ot use the approach which Xander gave and it helped me find the places where the canopy height was calculated to be negative.

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