 my second presentation will be much shorter than the first one I will talk about a really simple technique and almost an empiric technique to make better the visibility of some kind of description so the the technique uses three steps first one is making a three-dimensional model by by photogrammetry second step is consists in the transformations of this three-dimensional reconstruction into a digital elevation model and the third the third step is the application of different kinds of filters over this this digital elevation model we we let's start to start with some basic concept probably you already know it but what is photogrammetry by photogrammetry we can get special special special information about objects from a set of photographs and today the logical and most immediate consequence of this technique is the three-dimensional modeling thanks to the triangulation of a so-called point cloud and here we can we can see a normal point cloud of a structure without rendering and this the last pass of photogrammetry reconstruction is the rendering this is a thing think about the fact that this this degree of detail is from a low-end phone this is an emperor in most of an emperor's conserved in the National Museum of Roman art Madrid and so today technology can can can do such things even with with this low-end phone the second step is the transformation in a digital elevation model the digital elevation model is a concept of the geographical information system maybe with this you to have touches this touch at this this concept before and digital elevation models is a three-dimensional representation of the surface of a terrain surface and what it makes it interesting is the fact that even if it stores the three-dimensional model a three-dimensional model it stores it in a bidimensional image it's a grid in which every resolution square is colored according to its height is used as a normal user in geographical information system so let's see a couple of cases case of study the first one is both are from Barcelona the first one is an inscription and ugly inscription is more a mark stone mark that you can see in next to the cathedral if you if you know Barcelona you go you take Carrera del Bisbe Bisbe Street next to the cathedral you you are passing through the Roman gateway of the Roman of the Barquino the colony the Roman colony and you are passing through the the principal corridor on your right you have this this smart we can see here an enlargement and because of the kind of stone because the fact this inscription is located in a place of transition since 2000 years the stone is very the major this very erosive so an attempt to make a paper cast that is a more traditional technique and is for what I know this kind of paper can be both only in Germany and this expensive but is the traditional in this case it didn't give good results so we we tried to apply this to apply this this technique the first image is there is a photograph and the other two are three-dimensional model reconstructed and here is transformed into the digital elevation model these these images are a sort of maps where values are the marks of inscriptions and in this case I didn't apply any any complicated filter they are just color filter but we can we can see that for example in the in the in the first one the colored one we can observe even the small holes if you look to this series of all of holes you are the marks of the of the punch with which this inscription was was made and this degree of detail that cannot be reached with the traditional technique on this support about the the significance of this inscription this is of this ugly inscription it's not you see it's not the typical Roman inscription even if it's Roman one probably it's a mark stone mark of the fourth legion the fourth legion build a lot of things a lot of infrastructures here around and probably build also Barcelona this this numeral four plus a vexillum a banner of the army and this is for thanks to comparison second case second case much more more inscription better better one this was a really good inscription on a really good on a really fine stone but it was you reused and probably in part it was expressly delated so it's not so clear today is it's really complicated to interpret this this text so the first pass is the three-dimensional model some letters some characters that's pairing and this is the digital elevation model the first three image this this one and this one one more time color filters and they enhance the view of the of the inscription but the most interesting one is the last one since we have this digital elevation model that is basically used in the geographic information system we can apply algorithms typical of hydrological analysis for example some mechanics that usually is used in geography but this is a colored version of the last of the last mage and I made two transcription the first one is the one that I can read by simple color filtering and the second one this one is the one I can read thanks to the latter filter and the last line of the description it appears shows a P a point and an F we we have a P P use Felix it's it's the new lecture the new the new characters that are visible with this for filter and thank to this we can we can make the hypothesis that is an imperial description and making a query with this text over databases we can say it's between the third and the fourth century when they use such such such expressions so the three steps of the technique of the really simple technique I insist photogrammetry transformation into digital elevation model and application of filters normally used in geographical information system by the way the two interpretation I gave you about the inscription they are epigraph is much more trained than I agreed with this interpretation this technique can lead to a userful interpretation it was all thank you