"extent of the study" is correct and usable in written English.
You can use it when referring to the size or scope of a research study or project. For example, "Our study was limited in its extent, as it was only able to survey 200 people."
The issue of scaling is related to the grain size (pixel size), or the minimum mapping unit, and the extent of the study area.
While some recommendations on these aspects exist, they focus on Gaussian data and high ratios of the variogram range to the extent of the study area.
The top 3 measured impacts, in terms of lineal extent of the study trail segment impacted, were exposed roots, parallel trails, and soil erosion.
However, it is noted that to limit the extent of the study a constant coefficient of consolidation is assumed in the analysis presented here, though this assumption is easily relaxed.
In order to examine how a variation in the extent of the study area influences habitat selection of the raccoon, we ran models at two different scales at Lavandevil Wildlife Refuge and the Gilan Province.
A threshold analysis of the presence data was performed on the best model to define the minimum size of the presence data set with respect to the extent of the study area as well as the relative amounts of remote sensing derived response data to reach a stable performance of the model.
Three LC anticyclonic eddy separation events were observed with good 3D spatial coverage over the 2½ year extent of the field study; the three separations exhibited similar processes after the LC had extended into the eastern Gulf.
The understanding of spatial and temporal dynamics related to environmental determinants remains patchy, because the resolution and extent of the studies vary substantially.
The spatial extent of the studied range is quite large, and choice of distance class may play a role in the estimation of structure (Peakall et al. 2003).
Figure 2 Map showing spatial extents of the study area, location and distribution of surface waterholes identified using satellite data.
In step 1, it includes deciding on an appropriate working projection, establishing spatial extents of the study area, and assembling variously used spatial data from the study area so that the spatial component can be overlapped correctly.
