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Welcome to Hassan Sadiq new blog, Hassan is chairman at eegeo and smartcitti. He is a tech entrepreneur who specialises in Smart city IOT’s and 3D Mapping.  

Find out more about Hassan Sadiq and his work here, Like Hassan Sadiq on Facebook and Follow Hassan Sadiq on Twitter. 

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Transitioning from 2D to 3D City Models

Read Hassan Sadiq new blog post and learn more about meeting the demands for intensive mapping.

There is a higher demand to intensively map those parts of the earth that have been used. This includes cities and roads where the urbanisation rate requires people to look for up-to-date and detailed geo-data in three dimensions. These datasets are most helpful for city managers in order to prevent a decrease in the liveability of an area as well as to limit noise, air, and water pollution. It is also helpful in improving rapid emergency response as well as fair taxation. Read on as Hassan Sadiq Himex explains the process of transitioning from 2D city models to 3D ones.

A very crucial part of accomplishing this is getting a three-dimensional abstraction of the real world. Level of detail, which is more commonly known as LoD, is an important component of three-dimensional city models. Its concept is similar to the resolution of imagery as well as the scale of maps. It is related to both thematic and semantic richness as well as geometric detail.

Cities would be interested in the concept in the same manner that they would find 2D maps interesting. City models that are rendered in 3D can be used for a myriad of applications. They can offer more insights when using GIS products that are in 2D. In addition, they can also help enable new applications.

Hassan Sadiq Himex

There are people who think that LoD is just a different term for generalisation and abstraction in cartography and surveying, as well as resolution in terms of remote sensing. In a way, this is true. But also isn’t. LoD offers analogies in terms of generalisation, point cloud density, resolution, and scale. However, it is different in the sense that city models in 3D are different from maps since they encompass certain metrics other than geometry. This includes texture as well as semantic detail. Also, resolution is not a term that is suitable to be used on 3D city models. 3D city models are heterogeneous and different. For instance, landmarks and other parts of them can be modelled using different granularities.

There are propositions that state that there are no 3D city models that are considered as general purpose. Researchers and practitioners use this term to indicate the generic datasets that cities procure and then release as open data. A dataset in 2D may be collected once, but it can be sued for various purposes. However, this is not something that works the same way for 3D. Among the challenges include different requirements from one application to the next. Some data formats may prove to be interoperable too. In addition, there is also lacking thematic completeness.

Progress in the creation of three-dimensional city model is related to the advancements in technology for sensors as well as the capabilities of software in order to process data. Until recently, 3D model creation has been focused towards buildings instead of bridges and roads. The increasing data and sensor processing capabilities can result in city models that will have better thematic completeness. The improvements in technology use for sensors will then lead to finer LoDs as well as datasets that are going to be of higher quality. To find out more about Hassan Sadiq Himex, follow him on Twitter. Learn more about Hassan Sadiq Himex here