Sentinel-2 imageries with meteorological data utilize remote sensing and GIS for wheat crop prove production

Agricultural statistics are considered one of the most important topics in the developed countries now. In addition to the irrigation systems used, they relate to the quality and quantity of production and the consequent export and import of agricultural crops in order to achieve food security for the country. Therefore, the present traditional methods used in the collection of statistical data are not sufficient to cover the vast areas of cultivated strategic crops and to determine the effects therein. This is due to many factors, the most important of which is climatic changes. Hence the importance of the application of remote sensing techniques for image and data in the survey, agricultural statistics and monitoring of the quality and quantity of production using the latest satellite images available free from the owner of artificial satellite Sentinel2 which has spatial resolution of 10m instead of 30m available in artificial satellite Landsat8. Research results showed that the temperature can be controlled using modern techniques used in irrigation, which improves the atmosphere and thus contribute to providing a suitable environment for the wheat crop, which helps to increase the amount of production these have been clearly monitored using applicable indicators derived from satellite imageries data.


Introduction
Remote Sensing (RS) as defined in many scientific sources, is the science and art of obtaining data about an object, area or phenomenon under monitoring. Through specialized software, data obtained without physical contact is analyzed and information is generated about these phenomena [1]. At present, remote sensing techniques in most developed countries have become one of the most important methods used to monitor terrestrial environmental changes, particularly agricultural areas. The importance of monitoring the agricultural areas is due to the vast areas cultivated and the difficulty to control by traditional methods (field visits) and determine the areas and health status of the crops and their need for nutrition. In addition, agricultural production is linked to food security. Using technology, processing and analysis of remote sensing data and modern computers assist surveyors in measuring and monitoring the Earth's natural resources and identify changes periodically [2]. The Sentinel-2 satellite was launched on 23 June 2015 and received the first data within a selected study area on December 19, 2015. It continued to send data until the end of the monitoring process on 8 March 2016 by five satellite imageries. The Sentinel-2 is characterized by spatial resolution of 10 meters, which is suitable in determining the areas and health status of areas estimated at hundreds of donum suitable according to the criteria of remote sensing [3]. The meteorological data obtained from the Iraqi Ministry of Agriculture stations were linked to theoretical results of the imageries analysis in order to enhance the results because of significant impact on the crops. Research works to employ modern techniques of meteorological stations daily and Satellite Sentinel-2 imageries with high spatial resolution improve the the production of the wheat crop.

Objectives
The research aims to use modern techniques represented by using imageries of satellite Sentinel-2 that has made use of its data for the first time. In addition, integration of the satellite data and daily agricultural meteorologist and atmospheric data network affiliated to the Iraqi Ministry of Agriculture can predict the annual crop of wheat and derive the amount of output for large areas with high accuracy and less cost and effort.

Study areas
Areas of research and study are located in the Middle Euphrates region of Iraq in the province of Karbala; the first area is east of the province within the borders of Al-Hassainya Nahia and is called Agriculture Division of Imam Aoun. The second study area is west of the province within the borders of Ain al-Tamur Nahia and is called Agriculture Division of Ain al-Tamur (Fig. 1).
Agriculture Division of Imam Aoun depends on surface irrigation using electric pumps and the nature of the distribution of farms is irregular in forms and the soil is not fertile. The Agriculture Division of Ain al-Tamur has fertile soil and is characterized by farms with circle shape depending on the nature of the fixed pivot spraying irrigation, which depends on water artesian wells. The chart or table of crop growth stages is very important in order to describe the growth stages of each crop. It is important to understand the growth and development of wheat from sowing to maturity and harvesting for the proper use of fertilizers and pesticides to ensure the safety of the crop [4]. Many of the determinants and signs of increases constrain in use until certain stages of growth have been achieved. A widely used scale in the United States is the scale Feekes [5]. Feekes is distinguished from other measures as it gives a general description of the stages of the wheat crop growth which helps monitor the growth process by using remote sensing techniques to understand the changes taking place.

Growth stage scales
Agricultural meteorological stations of modern techniques are used in the collection of meteorological data. The stations are located in the center of the areas of study (see Fig. 2) for data to be collected in an orderly manner and accurate monitoring. Monitoring is done of several air elements which affect agricultural production. The meteorological stations monitor both degree of minimum and maximum temperature, the intensity of solar radiation as well as relative humidity of minimum and maximum, in addition to the many other elements. Temperature is one of the most important factors affecting the determination of the amount of agricultural production, as well as the production of agricultural crops through their direct and indirect effects.
Temperature affects the growth stages of different physiological processes occurring within the crop, as well as determines the places of spread and concentration of the crop in different geographic regions [6]. Thus, three temperature ranges (minimum, optimal, and maximum) for wheat crop were identified as shown in Table 1.

Growth stage scales
The Normalized Difference Vegetation Index (NDVI) law see equation (1), is used to calculate the vegetative intensity related to the health status of crops affected by external and internal surroundings of the crop. Moreover, data from remote sensing can be considered the best and fastest method as compared to the conventional way to efficiently manage nitrogen [7]. The equation (2) is used for change detection the contrast between two images for same band. The equation (3) is used for change detection the NDVI between two images at difference date. The logic of image algebra is for change detection using image differencing or band rationing [9].

Work steps
Research depended on the following data ( Fig. 3

Data collection and analysis stage for Agriculture Division of Imam Aoun.
Farm data (C & E) that depend on surface irrigation, which take irregular forms as in Fig. (4 & 7). Using ERDAS IMAGINE program has been for spectral reflectance calculation of the five samples installed on each farm see        38N   Fig. 9. The final production of the Farm E

Data collection and analysis stage for Agriculture Division of Ain al-Tamur.
Farm data (F & G) that rely on fixed pivot irrigation (sprinkler) and the farms take circular forms of regular sizes (60, 80, 120 donum) depending on the length of the sprayer as in Fig. (10 & 13). Using ERDAS IMAGINE program has been for spectral reflectance calculation of the five samples installed on each farm see Fig. (11 &  14) with the coordinates of taking samples as in the Table (4 & 5). Field visits each month final samples described as representing the production of the final average farm see Fig. (12 & 15).        Classification of both the regions of the study has been using the method of Maximum likelihood. Classification accuracy showed good results as in the Table (6 & 7). The quantity of wheat crop decreased by 686 donum from proven in the agricultural plan at Agriculture Division of Imam Aoun. While the Ain al-Tamur Agriculture Division has seen a marked rise in the quantity of production up to 3200 donum from what was mentioned in Sticky agricultural plan. See Fig. (18 &19). The first study area was classified into eight categories depending on the field visits and the points that were monitored using GPS, which proved the existence of different types of soil, random residential areas, palm trees, wheat and barley crops, as well as some water sources. While the second study, area was classified into five categories because of the lack of ground phenomena.

Conclusions
1. The effectiveness of spatial-resolution 10 meters in agricultural applications. 2. Efficiency indicators used to determine the damage to the phenomenon in the crop in record time too. 3. Production pivotal farms spray twice more than farms that depend surface irrigation. 4. Agricultural Meteorological data contributed to the finding and interpretation of the increase or the decline in farms during monitoring period. 5. Ain al-Tamur farms are considered an important source of wheat due to the clean water quality and the quality of virgin territory and irrigation sprinkler.