1

I'm trying to map out a bathymetric map of Hong Kong, and so I downloaded this data from the internet which included an .asc2 file and a .tiff file which should supposedly have information that will allow me to make a bathymetric map. But when I opened the asc2 file, the format was different from what I've seen in tutorials and guides (see below). So I edited it so that it looks like the below data. Then on arcmap, after starting a new map, I opened up the ASC2 to raster tool, then I put the .asc file in the input and just gave the name 'test' for the output and left the output data type as integer. I clicked okay but an error came up. Then I tried the .tif file; I opened up the raster to polygon tool (not sure if its the best for what I want to do), put the .tif file as the input, left 'Field' as it was, put 't' for the output. Deselected simplify polygons. Pressed 'Ok'. Then ended up with the below resutls.

enter image description here

I opened up the attribute table but the data doesn't really look like it can help me to map out water depths(?). I tried playing with the symbology and came up with this:

enter image description here

As you can see, there are a ton of values, a lot of which are negative numbers, so I don't know how I can make a map showing different depths. This looks like the type of data that is not for analysis or measurement. Do I have the wrong type of data for what I'm trying to do? Please do provide guidance as I'm very new to GIS.

Error when trying to convert asc2 to raster:

enter image description here

ASC2 file:

ncols 80

nrows 61

xllcorner 113.796500000000

yllcorner 22.084500000000

dx 0.008378750000

dy 0.008377049180

NODATA_value -32768

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 -14 -16 -16 -16 -14 -13 -11 -11 -12 -15 -19 -23 -25 -25 -23 -21 -20 -18 -18 -18 -19 -21 -22 -21 -21 -22 -22 -16 -1 4 -13 -28 -32 -33 -32 -31 -30 -29 -29 -29 -28 -28 -28 -28 -29 -31 -32 -33 -33 -32 -30 -28 -27 -27 -29 -31 -34 -36 -36 -36 -35 -34 -35 -38 -40 -40 -40 -39 -39 -38 -38 -37 -38 -40 -41 -41 -41 -40 -39 -39
2

This is a typical ASCII file format and you need to convert the file into raster using ASCII to Raster tool. You can access the tool from ArcToolbox -> Conversion Tools -> To Raster -> ASCII to Raster. You can save the file as .tif for a TIFF file format, .img for an ERDAS IMAGINE file format, or no extension for an Esri Grid raster format.

  • Do you mean I need to save the .asc file as a .tff/.img etc ? – David Jr Gbadago Mar 23 '17 at 9:19
  • I updated my answer. You need to use a ASCII to Raster tool located in ArcToolbox -> Conversion Tools -> To Raster -> ASCII to Raster – ahmadhanb Mar 23 '17 at 9:25
  • As I said before, there is an error when I try to convert it to raster from asc2. And also, it doesn't let me put .tiff for the output. – David Jr Gbadago Mar 23 '17 at 9:36
  • Normally the file should has extension of .asc not asc2. Make a copy of the file and change the extension to asc and try again. The extension of output is .tif not .tiff – ahmadhanb Mar 23 '17 at 9:39
  • Nothing worked. :( Just more errors. Maybe theres something wrong in the asc2 data itself? – David Jr Gbadago Mar 23 '17 at 9:44

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