[R-sig-Geo] How to deal with data points having the same lat long position?

[José Luis Rotundo]

Thanks Clint. I could try that. But I wanted to have data by lat and long
location.

Best regards,

Jose




2014-09-05 17:13 GMT-03:00 Clint Bowman <clint at ecy.wa.gov>:

> Jose,
>
> Are your units of yield in quantity/area or total quantity?  If yield is
> quantity/area, I think I would compute the average for each county with a
> reported yield.
>
> Clint
>
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>
> On Fri, 5 Sep 2014, Christopher Swingley wrote:
>
>  Jose,
>>
>> On Fri, Sep 5, 2014 at 10:29 AM, José Luis Rotundo <jrotundo at unr.edu.ar>
>> wrote:
>>
>>> I am working with a database of farm yields across USA and the objective
>>> is
>>> to map soybean yields. To preserve the identity of the farmers, they only
>>> provided the zipcode of the farm. Then I attached the zip code lat and
>>> long. The problem I have is that several farms belongs to the same
>>> zipcode
>>> and therefore they have the same lat and long. Having this repeated
>>> locations troubles the construction of the variogram.
>>>
>>
>> Wouldn't it be better to attach the sum of the soybean yields assigned
>> to a zip code to a vector layer containing zip code boundaries?  I can
>> imagine that if you assign values to a single point (even jittered
>> when there are duplicates for single zip code) per zip code, that you
>> won't wind up with a very accurate representation of the spatial
>> pattern because the area each zip code covers will be different.
>>
>> Cheers,
>>
>> Chris
>> --
>> Christopher Swingley
>> Fairbanks, Alaska
>> http://swingleydev.com/
>> cswingle at swingleydev.com
>>
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-- 


José L. Rotundo
CONICET
Facultad de Ciencias Agrarias
Univ. Nacional de Rosario
Zavalla, Santa Fe
Argentina

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