写出arcgis工具箱脚本：输入数据，然后根据图斑里其中一个字段的值相同、去把面积小于多少平方米参数值的图斑合并到相邻的图斑里去，在导出合并后的成果。

以下是一份可能实现上述功能的ArcGIS工具箱脚本代码：

import arcpy

# 定义参数
input_features = arcpy.Parameter(
    displayName="输入要素",
    name="input_features",
    datatype="GPFeatureLayer",
    parameterType="Required",
    direction="Input")

merge_field = arcpy.Parameter(
    displayName="合并字段",
    name="merge_field",
    datatype="GPString",
    parameterType="Required",
    direction="Input")

area_threshold = arcpy.Parameter(
    displayName="面积阈值（平方米）",
    name="area_threshold",
    datatype="GPLong",
    parameterType="Required",
    direction="Input")

output_features = arcpy.Parameter(
    displayName="输出要素",
    name="output_features",
    datatype="GPFeatureLayer",
    parameterType="Derived",
    direction="Output")

# 设置参数属性
output_features.parameterDependencies = [input_features.name, merge_field.name, area_threshold.name]

# 定义工具函数
def merge_small_features(input_features, merge_field, area_threshold):
    # 创建临时图层
    temp_layer = arcpy.MakeFeatureLayer_management(input_features, "temp_layer")
    # 按照合并字段排序
    arcpy.Sort_management(temp_layer, "temp_sorted", [[merge_field, "ASCENDING"]])
    # 获取要素总数
    total_count = arcpy.GetCount_management(temp_layer).getOutput(0)
    # 初始化计数器和进度条
    current_count = 0
    arcpy.SetProgressor("step", "正在合并要素...", 0, int(total_count))
    # 创建空间索引
    arcpy.AddSpatialIndex_management("temp_sorted")
    # 遍历要素，寻找相邻要素进行合并
    with arcpy.da.UpdateCursor("temp_sorted", ["SHAPE@", merge_field]) as cursor:
        previous_feature = None
        for current_feature in cursor:
            # 更新进度条
            current_count += 1
            arcpy.SetProgressorPosition(current_count)
            # 如果是第一个要素，则保存为前一个要素并继续循环
            if previous_feature is None:
                previous_feature = current_feature
                continue
            # 判断是否应该合并
            if current_feature[1] == previous_feature[1] and current_feature[0].area < area_threshold:
                # 合并要素
                new_geometry = previous_feature[0].union(current_feature[0])
                # 更新前一个要素的几何形状
                previous_feature[0] = new_geometry
                # 删除当前要素
                cursor.deleteRow()
            else:
                # 如果不需要合并，则将当前要素保存为前一个要素并继续循环
                previous_feature = current_feature
    # 将处理后的要素保存到输出要素参数中
    arcpy.CopyFeatures_management("temp_sorted", output_features)

# 调用工具函数
merge_small_features(input_features, merge_field, area_threshold)

此脚本将输入的要素图层按照指定的合并字段排序，然后遍历要素，根据指定的面积阈值判断是否需要合并到相邻要素中。如果需要合并，则将前一个要素的几何形状更新为合并后的几何形状，并删除当前要素；否则将当前要素保存为前一个要素。最后将处理后的要素保存到输出要素参数中。