I believe there were road works in close proximity to the church ... also logical to check out the trenches.
The initial searches were of necessity ad hoc with everyone hoping to find a wandered child.
Professional searchers keep a record of areas searched and the personnel searching, even volunteers ... so I would imagine there must be a copy somewhere, although I've not seen one.
If one thing is easily confirmed, it's the gigantic effort and commitment put into the search for Madeleine. This is how the searches were carried out;
Each search team always had an officer responsible for contact with the Lagos GNR Territorial Post, this officer would be attributed the area that the team would search and would give a photocopy of the marked area to each of the officers showing the indications about the technical manner the searches should adopt, with the formation of search lines, there had to be a visual over view of the limits of each officer's area and they were told to observe all accessible sites, where it could be possible to hide a girl or a body and the residents should be asked whether they had any useful information.
30. At the end of each search period, the individuals responsible for each group, whether they were officers or civilians, would present themselves at the Command Post, with the purpose of reporting the way in which the searches had been carried out, whether the whole of the attributed area had been searched and if any pertinent information had been gathered.
31. An organised group of volunteers, mainly English residents from the area, were also integrated into the searches, who also had a Command Post contact member, this group was attributed sectors that had been previously searched by GNR officers.
These are the people involved;
6 officers with dogs
20 officers from Lagos
10 officers from the Portimao Territorial Division
10 officers from the Silves Territorial Division
10 officers from Albufeira
15 officers from the Portimao Command Group
4 officers from the Faro TG
6 officers from GIPS
5 officers from Portimao Prosecutors Division
27. Others who took part in the searches were officers from the Lagos Public Security Police, the Maritime Police within their area of responsibility (maritime public domain), officers from Municipal Civil Protection, volunteer firemen from Lagos and from the Portuguese Red Cross.
28. Six officers from the Algarve Canine Rescue team (ECRA) - a legally constituted association - joined in the searches by volunteering their help at the P da L Operations Post.
http://www.mccannpjfiles.co.uk/PJ/GNR_SNIFFER.htm