The Management of Oyster Culture Leases and Production
267
size, it is recommended to convert pixels into polygons, perform an intersection and
compute the weighted sum of intersected depth polygons contained in each cadastre
polygon. In this present case, with a parcel size of around 40 metres and pixel size of
20 metres, this method is inappropriate, as the intersection of both polygons coverages
would yield over 100000 polygons. It is more reasonable (and much less time
consuming!) to use depth pixel
as representative of the pixel value and
compute the average of all
contained in a given parcel. This operation has
the advantage of being readily available in ArcView Spatial Analyst
It ends up with the attribute
appended to the lease file as shown in table
2 (Elevation in metres is positive above chart datum). Fig. 6 illustrates the case of Banc
de Ronce, with parcels colour-coded according to their elevation.
267
size, it is recommended to convert pixels into polygons, perform an intersection and
compute the weighted sum of intersected depth polygons contained in each cadastre
polygon. In this present case, with a parcel size of around 40 metres and pixel size of
20 metres, this method is inappropriate, as the intersection of both polygons coverages
would yield over 100000 polygons. It is more reasonable (and much less time
consuming!) to use depth pixel
as representative of the pixel value and
compute the average of all
contained in a given parcel. This operation has
the advantage of being readily available in ArcView Spatial Analyst
It ends up with the attribute
appended to the lease file as shown in table
2 (Elevation in metres is positive above chart datum). Fig. 6 illustrates the case of Banc
de Ronce, with parcels colour-coded according to their elevation.