According to some comments on some blogs, it seems Google Earth's scope will go beyond the initial web localization purposes; such is the case of the applications that are being oriented in the cadastre area. The Diario Hoy of the city of Mar de Plata publishes a case, in which it is being brought to the legislative level for georeferencing and valuation purposes.
In general, the laws of the municipalities or city councils establish the collection of real estate tax as a tax power that allows them to obtain resources, which can be reinvested in projects that improve the quality of life of its inhabitants. For this, the well-known “cadastral values” are used, and although there are different methods for their application, the purpose is for the owner of a property to pay a tax proportional to the “value” of the property for the costs that the municipality implies to provide public services and as a contribution to autonomy in the aspect of self-sustainability.
Undeclared assets are usually the ones that cause the greatest degree of complexity at the time of application of tax obligations and it is in this area that Google Earth is intended to be used in order to detect urban improvements and permanent crops. Apparently the instrument in Mar de Plata is only oriented towards the estimation of the tax, not for the appraisal notification or for the geometric definition of the properties since it is known that Google Earth images have a variable level of vagueness Because the terrain model used for orthorectification is conditioned by the number of control points; In this way, localities in developed countries have advantages with the number of geodesic points and "almost public" use.
The proposed law contains in one of its sections the following paragraph:
"When for reasons beyond the management of Cadastre There are territorial objects (houses or departments) that still form part of a cadastral parcel are not represented in an approved plan and registered according to the current regulations, that agency can individualize them, register them and assign them real estate by means of alternative methods of territorial delimitation that guarantee levels Accuracy, reliability and completeness comparable to the acts of measurement "
The proposal becomes interesting (technically dangerous), since ballots and charges can be issued, those that exist until the applicable administrative and technical procedure is carried out, which is usually an affidavit, the technical process that can be the property measurement, valuation Of land, identification of use and calculation of the tax according to the improvements or permanent crops.
Each time information technologies become more accessible and easier to manage, of course the risk is high, as it happened when all the children who learned to use ArcView decided that they did not need to learn cartographic concepts. Now whoever knows how to use Google Earth will say that he does not need to know geodesy?
Ultimately, the use of data such as those offered by Google Earth is a great solution in countries where there is no recent satellite image or orthophoto; many times because state agencies are weak in providing these services to municipalities. So if it comes to identifying swimming pools, new buildings, housing estates or areas of permanent cultivation, surely Google Earth can be a great ally. The same cannot be said if the information is to be used for legal purposes or the data is mixed with more precise surveys without making a differentiation that alerts new employees to a change of government.