Los mapas de pendiente de ArcMap 10.1 y 10.3 son diferentes

Question

<\/HEAD>Estaba examinando un mapa de pendiente que creé en ArcMap 10.1 hace aproximadamente un año. Calcular el mismo mapa de pendiente en ArcMap 10.3 me da resultados ligeramente diferentes. ¿Cambió algo en la forma en que se calcula la pendiente? Usé el mismo DEM de 100m hace un año que tengo hoy. Además, noté que el mapa de pendiente de 10.1 se abre con una simbología B&N estirada mientras que el mapa de pendiente de 10.3 se abre con una simbología clasificada. Las capturas de pantalla a continuación muestran los resultados ligeramente diferentes, incluyendo un aumento en el valor máximo de la pendiente.<\/P><\/BODY><\/HTML>

DanPatterson_Retired · Answer

Ok perhaps next time we can leave out the coordinate system.

If... the raster has the exact same extent (check again) in rows and columns and in UTM coordinates AND it has the same cell size and there is a difference.

Is the difference just random? (a screen grab would really help)

Were you using slope in degrees for both OR slope in percent for both?

ThomasNupp · Answer

Here are the results of the raster calculations. As you can see by the range of values and the mean differences the two slope maps are different. 444, 6791100, 1001.15 MBGRIDGenericfloating point32 Bit-3.40282346639e+038absentabsentNoneBasicPermanent3953822.73375472874.114169517274.1141693885922.73375NAD_1983_UTM_Zone_15NMeter (1.000000)Degree (0.0174532925199433)5000000-930.99960D_North_American_1983skipped columns:1, rows:1, ignored value(s): -8.706651687622077.199062824249268-0.068358556105292541.0596882485126030

DanPatterson_Retired · Answer

It looks like the extent are the same and the cell size.

Now subtract them (either in the raster calculator or by using the Minus key).

You should have effectively 0 within floating point error.

Report back

(could just be a symbology thing... in which case, save the symbology from the old raster, and use it for the new raster in the import symbology from... portion of the symbology pane.)