THE PROCEDURE: Centroids of buildings; Spatial join showing presence-absence, considering a 10m accuracy threshold, meaning if the centroid has not moved more than 10m, its the same building. If the centroid in 2012 is not in 2014, its considered as demolished. If a new centroid appears its considered new building.
Category Archives: ideas
Tipologías usuarios Madrid Río. Estadísticas y tendencias interesantes
Para la multitud de personas a las que como a mí, les ha sorprendido esta infrastructura en frente de sus casas hay posibilidad de encontrarse en el mismo metro cuadrado a alguien corriendo, alguien andando, una pareja con un carrito de niños, unos amigos en patines, alguna persona en bici… unos más rápido y unos más lento, todos hemos de convivir en un trazado de unos 7,5km de largo y no más unos metros de ancho, con lo que unas mínimas normas de circulación se imponen.
Pearson correlation and GIS
Do these two variables have a correlation?. To answer this important question first of all we have to know that only if it’s a linear relationship and there are no outliers we can take advantage of Mr Pearson’s correlation statiscal tool. If i love chocolate, does this mean i have tendency of being chuby? orContinue reading “Pearson correlation and GIS”
Comparing France Meteo and Spain Meteo from the visualization point of view
After living in France for four years i have to tell i am always aware of Meteo information on TV (well, i live in Brittany, i guess this makes sense!). It was the same in Spain or anywhere else in the world where i had lived and the reason why is i have always lovedContinue reading “Comparing France Meteo and Spain Meteo from the visualization point of view”
Remote Sensing, Photogrammetry, Lidar and Landuse IGN Spain
A few more lines for leting you know again that i passed this other course just now in Instituto Geográfico of Spain (IGN). Remote Sensing, Photogrammetry, Lidar and Landuse, a comprehensive 40h update on relevant information i need tu use on a daily basis. This ‘update’ helps me to better understand what i am working with andContinue reading “Remote Sensing, Photogrammetry, Lidar and Landuse IGN Spain”
La geografía española (con minúsculas)
Aquí la ‘convesación’ via twitter con el presentador de TVE Jacob Petrus. Me quejé de que se mencionara dentro de una frase, como tantas veces hemos oído, en radio y televisión, la expresión ‘La geografía española…’ refiriéndose a España en general. Lo que me indignó fue que Jacob Petrus es Geógrafo además de presentador generalistaContinue reading “La geografía española (con minúsculas)”
‘Reality Checks’, also called ‘Ground Truth Tests’
Comparing all kind of Geodata (i.e 3D Buildings, DTM, DHM, DSM, Land Use, vectors,…) to background sources as Google Earth/ Bing, available sources from the country we are working on or WMS available sources, etc. Figuring out if the data requested and we want to deliver is consistent enough compared to the so called “Truth”. SomeContinue reading “‘Reality Checks’, also called ‘Ground Truth Tests’”
RSME comparing LIDAR data with a third party’s 3D dataset
I would like to share with you an easy analysis i have been working in the last days. I had a vector dataset of buildings and i knew how high they were (there was a field called ‘AGL’ or Above Ground Level) and a LIDAR 2m resolution dataset over the city of London. My aimContinue reading “RSME comparing LIDAR data with a third party’s 3D dataset”
Analyse du Localisation des équipements publics relevant du thème ‘Sports, loisirs’ de Nantes Métropole
La première chose a dire, comme toujours est: Désolé pour mon français, je fais mon mieux:-) Aujourd’hui je voudrais faire l’analyse sur la localisation des équipements publics de la thématique ‘Sports, loisirs’ de Nantes Métropole. http://data.paysdelaloire.fr/donnees/detail/localisation-des-equipements-publics-relevant-du-theme-sports-loisirs-de-nantes-metropole/ Les données donnent les coordonnées et la catégorie (centre sportif, circuit de plein air, stade, gymnase, espace sportif de proximité,Continue reading “Analyse du Localisation des équipements publics relevant du thème ‘Sports, loisirs’ de Nantes Métropole”
PISA report SPAIN 2012 by Comunidades Autónomas Trends North-South and West-East
I wanted to take advantage of the latest ‘advanced course on Statistical Analysis’ followed in the spanish IGN and show you how North-South and West-East trends impact on this report. As you can see, the higher the values, the most likely to be in the North and the East of the country. This doesn’t meanContinue reading “PISA report SPAIN 2012 by Comunidades Autónomas Trends North-South and West-East”
Geovisualization.net 