About size of the study region

[bipana sadadev]

Hi Eric, 

I have a question regarding the area of the study region.In the example analyses section of distancesampling.org, you have uploaded the analysis of line transect data of winter wren and I am confused on how to estimate the area of the study region. Like in this case, the area is  33.2 ha. Can you please provide me with the information how to calculate this? I am also doing similar method for Hog deer in Nepal.

I have also uploaded the link: 

https://examples.distancesampling.org/Distance-lines/lines-distill.html

Regards, 

Bipana

[Eric Rexstad]

Bipana

Thanks for your question. "Study area" is defined as the region to which you can make inference from your study. In almost all cases, the boundaries of the study area are defined at the time the study is designed; in effect, defining the study area is the first decision made when conducting a study.

For a survey to be representative of the study area, the boundaries of that area must be defined. After defining the study area boundaries, a randomised sampling scheme can be defined. The representativeness of the sampling scheme can be assessed by computer means, see the very first example on our case study page.

Getting Started with dssd Distance sampling survey design. examples.distancesampling.org

The manner in which the size of the study area for the winter wren survey was determined can be seen from this satellite photo of the study area and adjacent agricultural land, shown in the example you cite:

The boundary of the wooded habitat can be seen in the image; the area within the open woodland can be calculated in a number of ways, perhaps using GIS software.

My main message is that the study area (hence its size) is determined prior to the establishment of a survey design or gathering of data.

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[bipana sadadev]

Hi Eric, 

Thank you so much for the informative email. I really apprecriate it. 

Regards, 

Bipana