Tag Archives: Mapping

Mapping of land cover and estimation of their emissivity values for gas flaring sites in the Niger Delta (Published)

This study examines the changes in land cover (LC) types at 6 gas flaring sites in Rivers State, Niger Delta region of Nigeria; and to estimate their emissivity (Ɛ) values. 15 Landsat scenes (3 Landsat 5 Thematic Mapper (TM) and 12 Landsat 7 Enhanced Thematic Mapper Plus (ETM+)) from 17 January 1986 to 08 March 2013 with < 30 % cloud contamination were used. All the sites are located within a single Landsat scene (Path 188, Row 057). Radiometric calibration of the multispectral bands of the data, and atmospheric correction for multispectral bands using dark object subtraction (DOS) method was carried out. The first unsupervised cluster analysis of the atmospherically corrected reflectance (bands 1-4) using the K-mean function of the MATLAB tool was carried out. The results obtained give 3 classes of LC type and cloud as the 4th class. The second cluster analysis was performed with the cloud-masked reflectance (bands 1-4) to give vegetation, soil, built up area and water LC types for all flaring sites. This was confirmed through the fieldwork observation for ground validation of Landsat 5 TM and Landsat 7 ETM+ in the Niger Delta that LC types obtained from satellite data are the same with those observed during the fieldwork. The method used to estimate Ɛ value for LC types at these sites is based on the Ɛ of 4 LC types present at each site. The changes in LC differ throughout the period for the 6 sites due to different human activities within each site. The Ɛ values estimated for the 4 LC types for the sites are not stable but changing from 1986 to 2013 due to changes in LC types. The results of LC classification show that K-mean method can distinguish up to 4 LC types very well in the Niger Delta.   

 

Keywords: Estimation, Gas-flaring, Land Cover, Mapping, Niger-Delta, emissivity

Measuring the Effects of Web-Based Pre-Writing Activities on EFL Learners’ Writing Performance (Published)

Adopting pre-writing activities to support and improve writing skill is widely recognized by the language practitioners as a beneficial micro-skill. Based on this, the current study aimed at finding the effect of the prewriting activities when they are done online such as diagramming, mapping outlining combined with traditional in-class writing instruction on helping EFL learners brainstorm, plan, organize and write. The study consists of two groups: experimental and control. The experimental group was taught by a combination of web-based prewriting activities and the traditional in-class writing instruction. The control group was taught by traditional in-class writing instruction based on the textbook only. The experimental design was utilized, with pre-posttest to compare the writing performance of the two groups of the study. T-test analysis results showed that there were significant differences in students’ writing competency between the two groups in favor of the experimental.

Keywords: Diagramming, Mapping, Outlining., Pre-writing Activities, Web-based Activities, Writing Performance

The Importance of Cadastral Survey Information for Effective Land Administration In Nigeria (Published)

Cadastral survey information is a subset of spatial information that is concerned with identifying and maintaining legal boundaries of properties. Land administration in Nigeria must of necessary involve a cadastral input; since land must be discussed in terms of location, extent size shape size shape ownership rights and encumbrances. Cadastral survey information has been positively improved by the advancement in computer and space technology and as well as techniques of information gathering, storage and dissemination for good land administration. Since land plays a major role in human activities. The task of any cadastral survey information is to register in a concise manner ownership-rights and other relationships between man and the land. There will be numerous problems in the country if there is no up-to-date digital database for effective land administration system. At present most of the maps being used for development in all the parts of the country are maps produced over two decades. This made development in some areas difficult because some of the locations on the maps had been physically built-up.

Keywords: Administration, Cadastral Survey Land, Information, Mapping

The Importance of Cadastral Survey Information for Effective Land Administration in Nigeria (Published)

Cadastral survey information is a subset of spatial information that is concerned with identifying and maintaining legal boundaries of properties. Land administration in Nigeria must of necessary involve a cadastral input; since land must be discussed in terms of location, extent size shape size shape ownership rights and encumbrances. Cadastral survey information has been positively improved by the advancement in computer and space technology and as well as techniques of information gathering, storage and dissemination for good land administration. Since land plays a major role in human activities. The task of any cadastral survey information is to register in a concise manner ownership-rights and other relationships between man and the land. There will be numerous problems in the country if there is no up-to-date digital database for effective land administration system. At present most of the maps being used for development in all the parts of the country are maps produced over two decades. This made development in some areas difficult because some of the locations on the maps had been physically built-up.

Keywords: Administration, Cadastral Survey Land, Information, Mapping

Change Detection in Landuse / Landcover Mapping in Asaba, Niger Delta B/W 1996 And 2015. A Remote Sensing and GIS Approach (Published)

Remote sensing is used in this research work for the development and acquisition of Landuse/land cover data, pattern and its attendant effects in Asaba, Delta State Nigeria. Remote sensing images and digital data verified by ground trothing (field work) satellite data are used to assess the rate of change in Landuse / Land cover between 1996 and 2015. It also examines the extent to which images and GIS softwares effectively contribute to mapping landuse/cover in the Niger Delta region. Remote sensing and geographic Information System (GIS) help integrate natural, cultural, social and economic information to create spatial information system on the available terrain resources. Sets of NARSDA images were acquired corresponding with the years, field checked to ascertain the data captured on the terrain.. The digital satellite data are incorporated as input data into IDRISI 32 GIS environmental to separately map out the landuse/land cover units and their magnitude determine. Five distinct units were identified in classification of landuse/landed cover pattern categories as follows: Farmland, Build up land, Waste land, Forest land and Water bodies. Land consumption rate indicate a progressive spatial expansion of the city was high in 1996/2006 and higher between 2006 and 2015. Also, land absorption coefficient being a measure of consumption of new urban land by increased urban population, was high between 1996 and 2006 and between 2006 and 2015. Ground trothing was carried out to ascertain the accuracy of data and there are major changes in the landuse/land cover. It was discovered that there is rapid inbuilt-up areas evidently explained in buildings projects that resulted in decrease in forest land, agricultural land and open space. This is attributed to the anthropogenic activities of farming, bush burning, grazing, etc. However, the area occupied by water remained unchanged over the years. This study demonstrates that remotely sensed data and GIS based approach is found to be timely and cost effective than the conventional method of analysis, classification of land use pattern effective for planning and management

Keywords: Change Detection, Geographic information System (GIS), IDRISI 32 software, Land Cover, Landuse, Mapping, Remote Sensing, Satellite image