Transform a grid map into a contour map

[GoldenJiang]

I want to transform this grid map below (polygon, 10 m*10 m) into a contour map and make it less spotty. Is it possible to achieve so?

The value field only contains 10, 20, 30, which represent my management classes (calculated from excel spreadsheet).

[DanPatterson_Retired]

contour is for contours Contour—Help | ArcGIS for Desktop

but raster to polygon with Generalize option may work Raster to Polygon—Help | ArcGIS for Desktop

although I doubt you will be wholly pleased with the result given the coarse nature of the raster.

[GoldenJiang]

I have an idea: is it possible to generate points on the grid and then contour these points?

[DanPatterson_Retired]

of course... Point to Raster—Help | ArcGIS for Desktop

have you tried anything yet? You have several options now to test and compare

[GoldenJiang]

Hi Dan, the grid map I have is actually a polygon. I've tried 'polygon to raster' (cell size 1.3) and then 'raster to polygon'. Eventually I got this:

But it won't get rid of the spots...

[SteveLynch]

Golden

Please try Neil's suggestion and I'm sure that you'll get what you want.

By default we use nearest neighbor resampling when displaying a raster and you can change it to bilinear or cubic to get a smoother look.

-Steve

[GoldenJiang]

Can I remove the small spots on this to make the map tidier? 

[DanPatterson_Retired]

Ok... confusion reigns... are you trying to interpolate a new surface given some input points etc or... are you stuck with what you have as an image/raster and you are trying to fix it up by smoothing it out?

[GoldenJiang]

My main purpose is to show more clear and practical treatment areas. I am sure I am getting closed: polygon to raster - create random points - extract values to points - kriging. I think it would get better result to create sampling points that are regularly distributed throughout the area, but I am not sure how......

[DanPatterson_Retired]

It has been suggested several times, that other interpolates will give you the smooth result that you appear to need.  Do you have some comparative results so that any further suggestions might produce your desired result