[GRASS-user] compare a DCELL and FCELL question
Micha Silver
tsvibar at gmail.com
Sun Jan 24 02:10:10 PST 2021
I can see that the maximum values are different. Have a look at the
Range values.
What are you trying to do? Maybe there's a simpler approach...
On Sun, Jan 24, 2021 at 11:49 AM ming han <dustming at gmail.com> wrote:
>
> Hi Micha
>
> Many thanks for your reply.
> Here is the command I am using:
>
> if(float(cat1_acc_riv) == float(cat1_minacc), str_r, null())
>
> The str_r is a CELL raster. the result is different when I change it to:
> if(int(cat1_acc_riv) == int(cat1_minacc), str_r, null())
>
> Here is output of r.info for first DCELL raster
>
> +----------------------------------------------------------------------------+
> | Map: cat1_acc_riv at PERMANENT Date: Sat Jan 23 22:58:42 2021 |
> | Mapset: PERMANENT Login of Creator: m43han |
> | Location: main_working_location |
> | DataBase: C:\Users\m43han\Documents\Routing_Prod\Prod000001\grassdb |
> | Title: cat1_acc_riv |
> | Timestamp: none |
> |----------------------------------------------------------------------------|
> | |
> | Type of Map: raster Number of Categories: 19432056 |
> | Data Type: DCELL |
> | Rows: 4239 |
> | Columns: 9254 |
> | Total Cells: 39227706 |
> | Projection: Latitude-Longitude |
> | N: 50:52:39N S: 40:16:48N Res: 0:00:09 |
> | E: 70:10:39W W: 93:18:45W Res: 0:00:09 |
> | Range of data: min = 250752 max = 19432056 |
> | |
> | Data Description: |
> | generated by r.mapcalc |
> | |
> | Comments: |
> | if(isnull(str_r), null(), acc) |
> | |
> +----------------------------------------------------------------------------+
> (Sun Jan 24 04:45:38 2021) Command finished (0 sec)
>
>
> Here is r.info output for second raster
> +----------------------------------------------------------------------------+
> | Map: cat1_minacc at PERMANENT Date: Sat Jan 23 22:58:48 2021 |
> | Mapset: PERMANENT Login of Creator: m43han |
> | Location: main_working_location |
> | DataBase: C:\Users\m43han\Documents\Routing_Prod\Prod000001\grassdb |
> | Title: cat1_minacc |
> | Timestamp: none |
> |----------------------------------------------------------------------------|
> | |
> | Type of Map: raster Number of Categories: 0 |
> | Data Type: FCELL |
> | Rows: 4239 |
> | Columns: 9254 |
> | Total Cells: 39227706 |
> | Projection: Latitude-Longitude |
> | N: 50:52:39N S: 40:16:48N Res: 0:00:09 |
> | E: 70:10:39W W: 93:18:45W Res: 0:00:09 |
> | Range of data: min = 250752 max = 1.817303e+007 |
> | |
> | Data Description: |
> | generated by r.stats.zonal |
> | |
> | Comments: |
> | r.stats.zonal --overwrite base="str_r" cover="cat1_acc_riv" method="\ |
> | min" output="cat1_minacc" |
> | |
> +----------------------------------------------------------------------------+
> (Sun Jan 24 04:46:50 2021) Command finished (0 sec)
>
> Thanks
> Ming
>
>
> Micha Silver <tsvibar at gmail.com> 于2021年1月24日周日 上午3:29写道：
>>
>> Is there some reason that you expect the rasters to be the same? Maybe
>> begin by posting the outputs of `r.info` for both rasters, and what
>> command you used to compare them?
>>
>> On Sun, Jan 24, 2021 at 6:13 AM ming han <dustming at gmail.com> wrote:
>> >
>> > Hi Everyone
>> >
>> > I tried to compare if grids in two rasters are the same, one raster is FCELL and another raster is DCELL. I got different result when I int both raster first before comparing them; and when I float() both raster first before I comparing them
>> >
>> > Is there any reason for this?
>> >
>> > Thanks
>> > Ming
>> > _______________________________________________
>> > grass-user mailing list
>> > grass-user at lists.osgeo.org
>> > https://lists.osgeo.org/mailman/listinfo/grass-user
>>
>>
>>
>> --
>> Micha Silver
>> Ben Gurion Univ
>> Sde-Boker Remote Sensing Lab
>> cell: +972 (52) 3665918
--
Micha Silver
Ben Gurion Univ
Sde-Boker Remote Sensing Lab
cell: +972 (52) 3665918
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