## 3 Results  
The implementation of remote sensing indices using Landsat Level1 satellite images provides good results in terms of built-up areas delineation, the results being thus useful in the process of spatial planning and issuing public policies for the harmonious development of the territory. Based on the integrated analysis of remote sensing indices, built-up areas for the following years 2000, 2005, 2010, 2013, 2016, and 2019 were identified, observing a strong dynamic in terms of the growth of built-up area, both for consecutive years and through the entire analysis period (Table 2).  
The analysis of the quantitative data obtained from the exploitation of the digital databases, resulting from the implementation of the proposed model, highlights a very high dynamic for the entire analyzed period (2000-2019), of the built territory after to Floresti ATU and Apahida ATU; dynamics explained by the location of those two ATUs on the east-west development axis of Cluj-Napoca city, the axis dictated by the morphology of the place that constitutes the corridor of the Somesul Mic river.  
For the municipality of Cluj-Napoca, the same accentuated dynamics can be observed, achieving an increase in the built surfaces, from 11.13% in 2000 to 20.07% in 2019, which represents an increase of almost double the amount of the built surfaces in the analyzed period.  
In addition to the morphological constraints, as a negative factor for limiting the built areas, the urban restrictions imposed by the development of Avram Iancu International Airport (Cluj-Napoca), which especially affects Apahida ATU and the eastern part of Cluj-Napoca ATU, as well as the naturally associated risks (landslides, floods); risks that are mainly manifested in the immediate vicinity of the urban area, in Apahida, Floresti, and Baciu ATUs.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline  & \multicolumn{6}{c}{**Area Covered by Buildings. (\%)**} \\
**TAU** & **2000** & **2005** & **2010** & **2013** & **2016** & **2019** & **2019-2000** \\ \hline FLORESTI & 1.28 & 3.63 & 5.73 & 6.85 & 8.44 & 9.59 & 8.30 \\ BACIU & 0.43 & 0.80 & 0.99 & 1.03 & 2.39 & 3.01 & 2.58 \\ CHINTENI & 0.10 & 0.11 & 0.20 & 0.27 & 0.86 & 0.88 & 0.78 \\ APAHIDA & 2.55 & 2.85 & 3.33 & 3.38 & 6.30 & 7.91 & 5.36 \\ FELEACU & 0.02 & 0.49 & 1.92 & 2.05 & 2.46 & 2.90 & 2.88 \\ CLUJ-NAPOCA & 11.13 & 13.93 & 14.54 & 14.35 & 18.88 & 20.70 & 9.57 \\ \hline \hline \end{tabular}  
* TAU-Territorial Administrative Units (used by reference areas).  
\end{table}
Table 2: Analysis of the surfaces occupied by constructions in the 2000–2019 period.  
In the case of Floresti ATU, the favorable factor of the Somesul Mic river meadow intervenes, being a relief unit which is very extensive and suitable for constructions, to which is added the relatively low price of land and the orientation of real estate developers towards areas with easy access in terms of communications and related utilities, parameters that led to an accentuated development of the locality, becoming a sleeping district of the city of Cluj-Napoca. Due to this situation, an increase of about eight times the built territory can be observed from 1. 28% at the level of 2000 to 9.59% at the level of 2019.  
The small dynamics regarding the increase in the areas occupied by constructions, identified for Chinteni and Feleacu ATUs, can be explained mainly by the lack of access and utilities of public necessity, which attracted a lack of interest of large real estate developers and economic agents.